wildmatch: rename constants and update prototype

- All exported constants now have a prefix WM_
- Do not rely on FNM_* constants, use the WM_ counterparts
- Remove TRUE and FALSE to follow Git's coding style
- While at it, turn flags type from int to unsigned int
- Add an (unused yet) argument to carry extra information
  so that we don't have to change the prototype again later
  when we need to pass other stuff to wildmatch

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

wildmatch.h

@@ -1,9 +1,17 @@
-/* wildmatch.h */
+#ifndef WILDMATCH_H
+#define WILDMATCH_H
 
-#define ABORT_MALFORMED 2
-#define NOMATCH 1
-#define MATCH 0
-#define ABORT_ALL -1
-#define ABORT_TO_STARSTAR -2
+#define WM_CASEFOLD 1
 
-int wildmatch(const char *pattern, const char *text, int flags);
+#define WM_ABORT_MALFORMED 2
+#define WM_NOMATCH 1
+#define WM_MATCH 0
+#define WM_ABORT_ALL -1
+#define WM_ABORT_TO_STARSTAR -2
+
+struct wildopts;
+
+int wildmatch(const char *pattern, const char *text,
+	      unsigned int flags,
+	      struct wildopts *wo);
+#endif