fixup! mingw: implement a platform-specific strbuf_realpath()

This is needed to let the code compile without error.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

compat/mingw.h

@@ -446,6 +446,7 @@ static inline void convert_slashes(char *path)
 #define PATH_SEP ';'
 char *mingw_query_user_email(void);
 #define query_user_email mingw_query_user_email
+struct strbuf;
 char *mingw_strbuf_realpath(struct strbuf *resolved, const char *path);
 #define platform_strbuf_realpath mingw_strbuf_realpath
 #if !defined(__MINGW64_VERSION_MAJOR) && (!defined(_MSC_VER) || _MSC_VER < 1800)