fixup! mingw: handle absolute paths in expand_user_path()

This drops Git for Windows' version in preparation for merging the
version that made it upstream, followed by reinstating the
now-deprecated handling of a leading slash on Windows.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

path.c

@@ -12,7 +12,6 @@
 #include "packfile.h"
 #include "object-store.h"
 #include "lockfile.h"
-#include "exec-cmd.h"
 
 static int get_st_mode_bits(const char *path, int *mode)
 {
@@ -733,10 +732,6 @@ char *expand_user_path(const char *path, int real_home)
 
 	if (path == NULL)
 		goto return_null;
-#ifdef __MINGW32__
-	if (path[0] == '/')
-		return system_path(path + 1);
-#endif
 	if (path[0] == '~') {
 		const char *first_slash = strchrnul(path, '/');
 		const char *username = path + 1;