Move the definition of has_dos_drive_prefix to compat/mingw.c

This cannot easily be an inline function because it uses isalpha(), which
is not yet declared when compat/mingw.c is parsed and so would give a
compiler warning.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>

compat/mingw.h

@@ -192,6 +192,7 @@ sig_handler_t mingw_signal(int sig, sig_handler_t handler);
  * git specific compatibility
  */
 
+#define has_dos_drive_prefix(path) (isalpha(*(path)) && (path)[1] == ':')
 #define PATH_SEP ';'
 #define PRIuMAX "I64u"
 

git-compat-util.h

@@ -113,6 +113,10 @@
 #define PATH_SEP ':'
 #endif
 
+#ifndef has_dos_drive_prefix
+#define has_dos_drive_prefix(path) 0
+#endif
+
 #ifdef __GNUC__
 #define NORETURN __attribute__((__noreturn__))
 #else
@@ -467,20 +471,4 @@ void git_qsort(void *base, size_t nmemb, size_t size,
 # define FORCE_DIR_SET_GID 0
 #endif
 
-#ifdef __MINGW32__
-
-static inline int has_dos_drive_prefix(const char *path)
-{
-	return isalpha(*path) && path[1] == ':';
-}
-
-#else /* __MINGW32__ */
-
-static inline int has_dos_drive_prefix(const char *path)
-{
-	return 0;
-}
-
-#endif /* __MINGW32__ */
-
 #endif