Fix glob() for Win64

_fintfirst() is declared in the Mingw-w64 headers as an intptr_t,
which tracks.  Can't find _findfirst on MSDN, so that's good enough
for me... let's see what the pipeline says.

src/xpdev/dirwrap.c

@@ -231,7 +231,7 @@ int	glob(const char *pattern, int flags, void* unused, glob_t* glob)
 int	glob(const char *pattern, int flags, void* unused, glob_t* glob)
 {
     struct	_finddata_t ff;
-	long	ff_handle;
+	intptr_t ff_handle;
 	size_t	found=0;
 	char	path[MAX_PATH+1];
 	char*	p;