fixup! Win32: support long paths

A recent fix by Stefan Beller forces `git submodule` to use absolute
paths all around. This, however, breaks our tests because all of a
sudden, a relative path that was just barely within the maximal path
size now extends it as an absolute path.

A brief test on this developer's Windows 10 showed, though, that the
claim that "SetCurrentDirectoryW doesn't support long paths" does not
hold up to reality: simply lifting the limitation still works, and even
better: it lets t7413 pass (and it does not pass with Stefan's patch).

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

Author: dscho

compat/mingw.c

@@ -614,9 +614,8 @@ int mingw_chdir(const char *dirname)
 	int result;
 	DECLARE_PROC_ADDR(kernel32.dll, DWORD, GetFinalPathNameByHandleW,
 			  HANDLE, LPWSTR, DWORD, DWORD);
-	wchar_t wdirname[MAX_PATH];
-	/* SetCurrentDirectoryW doesn't support long paths */
-	if (xutftowcs_path(wdirname, dirname) < 0)
+	wchar_t wdirname[MAX_LONG_PATH];
+	if (xutftowcs_long_path(wdirname, dirname) < 0)
 		return -1;
 
 	if (has_symlinks && INIT_PROC_ADDR(GetFinalPathNameByHandleW)) {