Change mch_errmsg and mch_msg from macro to function

src/nvim/vim.h

@@ -35,10 +35,6 @@ enum { NUMBUFLEN = 65 };
 
 #include "nvim/gettext.h"
 
-#ifdef WIN32
-# include "nvim/mbyte.h"  // for utf8_to_utf16
-#endif
-
 // special attribute addition: Put message in history
 #define MSG_HIST                0x1000
 
@@ -291,30 +287,7 @@ enum { FOLD_TEXT_LEN = 51 };  //!< buffer size for get_foldtext()
 // functions of these names. The declarations would break if the defines had
 // been seen at that stage.  But it must be before globals.h, where error_ga
 // is declared.
-#ifdef WIN32
-# define mch_errmsg(str) \
-  do { \
-    wchar_t *utf16str; \
-    int conversion_result = utf8_to_utf16((str), &utf16str); \
-    if (conversion_result != 0) { \
-      EMSG2("utf8_to_utf16 failed: %d", conversion_result); \
-    } else { \
-      fwprintf(stderr, L"%ls", utf16str); \
-      xfree(utf16str); \
-    } \
-  } while (0)
-# define mch_msg(str) \
-  do { \
-    wchar_t *utf16str; \
-    int conversion_result = utf8_to_utf16((str), &utf16str); \
-    if (conversion_result != 0) { \
-      EMSG2("utf8_to_utf16 failed: %d", conversion_result); \
-    } else { \
-      wprintf(L"%ls", utf16str); \
-      xfree(utf16str); \
-    } \
-  } while (0)
-#else
+#ifndef WIN32
 # define mch_errmsg(str)        fprintf(stderr, "%s", (str))
 # define mch_msg(str)           printf("%s", (str))
 #endif