fixup! Port header fixes from MSys2

Whoops. The code does not even compile without this.

Author: dscho

compat/mingw.h

@@ -395,6 +395,8 @@ int mingw_offset_1st_component(const char *path);
 #ifndef __MINGW64_VERSION_MAJOR
 #define PRIuMAX "I64u"
 #define PRId64 "I64d"
+#else
+#include <inttypes.h>
 #endif
 
 void mingw_open_html(const char *path);