src: Misc. cleanup

These macros (and global) haven't been used since
3baba1e7bc

src/nvim/globals.h

@@ -1048,10 +1048,6 @@ EXTERN int typebuf_was_filled INIT(= FALSE);      /* received text from client
                                                      or from feedkeys() */
 
 
-#if defined(UNIX)
-EXTERN int term_is_xterm INIT(= FALSE);         /* xterm-like 'term' */
-#endif
-
 #ifdef BACKSLASH_IN_FILENAME
 EXTERN char psepc INIT(= '\\');         /* normal path separator character */
 EXTERN char psepcN INIT(= '/');         /* abnormal path separator character */

src/nvim/keymap.c

@@ -291,8 +291,6 @@ static struct key_name_entry {
   {0,                 NULL}
 };
 
-#define KEY_NAMES_TABLE_LEN ARRAY_SIZE(key_names_table)
-
 static struct mousetable {
   int pseudo_code;              /* Code for pseudo mouse event */
   int button;                   /* Which mouse button is it? */

src/nvim/screen.c

@@ -6415,18 +6415,6 @@ static void win_rest_invalid(win_T *wp)
  * screen changes, and in the meantime, everything still works.
  */
 
-/*
- * types for inserting or deleting lines
- */
-#define USE_T_CAL   1
-#define USE_T_CDL   2
-#define USE_T_AL    3
-#define USE_T_CE    4
-#define USE_T_DL    5
-#define USE_T_SR    6
-#define USE_NL      7
-#define USE_T_CD    8
-#define USE_REDRAW  9
 
 // insert lines on the screen and update ScreenLines[]
 // 'end' is the line after the scrolled part. Normally it is Rows.