rts: Use long-path-aware stat

Previously `pathstat` relied on msvcrt's `stat` implementation, which was
not long-path-aware. It should rather be defined in terms of the `stat`
implementation provided by `utils/fs`.

Fixes #19541.

rts/PathUtils.h

@@ -12,10 +12,13 @@
 
 // Use wchar_t for pathnames on Windows (#5697)
 #if defined(mingw32_HOST_OS)
+#include "fs_rts.h"
+
 #define pathcmp wcscmp
 #define pathlen wcslen
-#define pathopen __rts_fwopen
-#define pathstat _wstat
+// N.B. Use the Win32-based file routines from utils/fs.
+#define pathopen FS(fwopen)
+#define pathstat FS(_wstat)
 #define struct_stat struct _stat
 #define open wopen
 #define WSTR(s) L##s

utils/fs/fs.c

@@ -21,8 +21,6 @@
 #include <io.h>
 #include <fcntl.h>
 #include <wchar.h>
-#include <sys/stat.h>
-#include <sys/types.h>
 #include <share.h>
 #include <errno.h>
 

utils/fs/fs.h

@@ -25,6 +25,12 @@
 
 #if defined(_WIN32)
 #include <wchar.h>
+// N.B. <sys/stat.h> defines some macro rewrites to, e.g., turn _wstat into
+// _wstat64i32. We must include it here to ensure tat this rewrite applies to
+// both the definition and use sites.
+#include <sys/types.h>
+#include <sys/stat.h>
+
 wchar_t* FS(create_device_name) (const wchar_t*);
 int FS(translate_mode) (const wchar_t*);
 int FS(swopen) (const wchar_t* filename, int oflag,