Include stdbool.h in some files which use it

Done by manual inspection of the output of this script:
grep -r -l -w "bool\|true\|false" * | grep 'c$\|h$' > has_bool
grep -r -l "stdbool.h" * | grep 'c$\|h$' > has_include
grep -F -x -v -f has_include has_bool

src/nvim/api/buffer.c

@@ -1,6 +1,7 @@
 // Much of this code was adapted from 'if_py_both.h' from the original
 // vim source
 #include <errno.h>
+#include <stdbool.h>
 #include <stdint.h>
 #include <stdlib.h>
 

src/nvim/arabic.c

@@ -10,6 +10,8 @@
 /// Final       - unicode form-B final    char denoted with  a_f_*
 /// Stand-Alone - unicode form-B isolated char denoted with  a_s_* (NOT USED)
 
+#include <stdbool.h>
+
 #include "nvim/vim.h"
 #include "nvim/ascii.h"
 #include "nvim/arabic.h"

src/nvim/arabic.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_ARABIC_H
 #define NVIM_ARABIC_H
 
+#include <stdbool.h>
+
 /// Whether c belongs to the range of Arabic characters that might be shaped.
 static inline bool arabic_char(int c)
 {

src/nvim/buffer_defs.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_BUFFER_DEFS_H
 #define NVIM_BUFFER_DEFS_H
 
+#include <stdbool.h>
+
 // for garray_T
 #include "nvim/garray.h"
 // for pos_T and lpos_T

src/nvim/digraph.c

@@ -2,6 +2,7 @@
 ///
 /// code for digraphs
 
+#include <stdbool.h>
 #include <inttypes.h>
 
 #include "nvim/vim.h"

src/nvim/ex_cmds.c

@@ -11,6 +11,7 @@
  */
 
 #include <errno.h>
+#include <stdbool.h>
 #include <string.h>
 #include <stdlib.h>
 #include <inttypes.h>

src/nvim/ex_cmds.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_EX_CMDS_H
 #define NVIM_EX_CMDS_H
 
+#include <stdbool.h>
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "ex_cmds.h.generated.h"
 #endif

src/nvim/ex_cmds_defs.h

@@ -14,6 +14,8 @@
 # define NVIM_EX_CMDS_DEFS_H
 #endif
 
+#include <stdbool.h>
+
 #include "nvim/normal.h"
 
 /*

src/nvim/ex_getln.c

@@ -11,6 +11,7 @@
  */
 
 #include <errno.h>
+#include <stdbool.h>
 #include <string.h>
 #include <stdlib.h>
 #include <inttypes.h>

src/nvim/globals.h

@@ -8,6 +8,8 @@
 #ifndef NVIM_GLOBALS_H
 #define NVIM_GLOBALS_H
 
+#include <stdbool.h>
+
 #include "nvim/ex_eval.h"
 #include "nvim/mbyte.h"
 #include "nvim/menu.h"

src/nvim/indent.c

@@ -1,4 +1,5 @@
 #include <inttypes.h>
+#include <stdbool.h>
 
 #include "nvim/ascii.h"
 #include "nvim/indent.h"

src/nvim/mbyte.c

@@ -78,6 +78,7 @@
 
 #include <errno.h>
 #include <inttypes.h>
+#include <stdbool.h>
 #include <string.h>
 #include <wchar.h>
 #include <wctype.h>

src/nvim/mbyte.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_MBYTE_H
 #define NVIM_MBYTE_H
 
+#include <stdbool.h>
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "mbyte.h.generated.h"
 #endif

src/nvim/misc1.c

@@ -12,6 +12,7 @@
 
 #include <errno.h>
 #include <inttypes.h>
+#include <stdbool.h>
 #include <string.h>
 
 #include "nvim/vim.h"

src/nvim/move.c

@@ -17,6 +17,7 @@
  */
 
 #include <inttypes.h>
+#include <stdbool.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"

src/nvim/move.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_MOVE_H
 #define NVIM_MOVE_H
 
+#include <stdbool.h>
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "move.h.generated.h"
 #endif

src/nvim/normal.c

@@ -14,6 +14,7 @@
 #include <errno.h>
 #include <inttypes.h>
 #include <string.h>
+#include <stdbool.h>
 #include <stdlib.h>
 
 #include "nvim/vim.h"

src/nvim/option_defs.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_OPTION_DEFS_H
 #define NVIM_OPTION_DEFS_H
 
+#include <stdbool.h>
+
 #include "nvim/types.h"
 
 // option_defs.h: definition of global variables for settable options

src/nvim/os/event_defs.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_OS_EVENT_DEFS_H
 #define NVIM_OS_EVENT_DEFS_H
 
+#include <stdbool.h>
+
 #include "nvim/os/job_defs.h"
 #include "nvim/os/rstream_defs.h"
 

src/nvim/popupmnu.c

@@ -3,6 +3,7 @@
 /// Popup menu (PUM)
 //
 #include <inttypes.h>
+#include <stdbool.h>
 
 #include "nvim/vim.h"
 #include "nvim/ascii.h"

src/nvim/regexp_defs.h

@@ -12,6 +12,8 @@
 #ifndef NVIM_REGEXP_DEFS_H
 #define NVIM_REGEXP_DEFS_H
 
+#include <stdbool.h>
+
 #include "nvim/pos.h"
 
 /*

src/nvim/search.c

@@ -11,6 +11,7 @@
 
 #include <errno.h>
 #include <inttypes.h>
+#include <stdbool.h>
 #include <string.h>
 
 #include "nvim/ascii.h"

src/nvim/spell.c

@@ -286,6 +286,7 @@
 
 #include <errno.h>
 #include <inttypes.h>
+#include <stdbool.h>
 #include <string.h>
 #include <stdlib.h>
 #include <wctype.h>

src/nvim/spell.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_SPELL_H
 #define NVIM_SPELL_H
 
+#include <stdbool.h>
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "spell.h.generated.h"
 #endif

src/nvim/syntax.c

@@ -13,6 +13,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <inttypes.h>
+#include <stdbool.h>
 #include <string.h>
 #include <stdlib.h>
 

src/nvim/syntax.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_SYNTAX_H
 #define NVIM_SYNTAX_H
 
+#include <stdbool.h>
+
 #include "nvim/buffer_defs.h"
 
 typedef int guicolor_T;

src/nvim/tag.c

@@ -12,6 +12,7 @@
 
 #include <errno.h>
 #include <inttypes.h>
+#include <stdbool.h>
 #include <string.h>
 
 #include "nvim/vim.h"

src/nvim/term.c

@@ -24,6 +24,7 @@
 #define tgetstr tgetstr_defined_wrong
 #include <errno.h>
 #include <inttypes.h>
+#include <stdbool.h>
 #include <string.h>
 
 #include "nvim/vim.h"

src/nvim/ui.c

@@ -16,6 +16,7 @@
  */
 
 #include <inttypes.h>
+#include <stdbool.h>
 #include <string.h>
 
 #include "nvim/vim.h"

src/nvim/ui.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_UI_H
 #define NVIM_UI_H
 
+#include <stdbool.h>
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "ui.h.generated.h"
 #endif

src/nvim/undo.c

@@ -82,6 +82,7 @@
 
 #include <inttypes.h>
 #include <errno.h>
+#include <stdbool.h>
 #include <string.h>
 
 #include "nvim/vim.h"

src/nvim/window.c

@@ -9,6 +9,7 @@
 #include <errno.h>
 #include <assert.h>
 #include <inttypes.h>
+#include <stdbool.h>
 
 #include "nvim/api/private/handle.h"
 #include "nvim/vim.h"

src/nvim/window.h

@@ -1,6 +1,8 @@
 #ifndef NVIM_WINDOW_H
 #define NVIM_WINDOW_H
 
+#include <stdbool.h>
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "window.h.generated.h"
 #endif