Adding upstream version 9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

lib/chmod.c

@@ -0,0 +1,47 @@
+/* Implement chmod on platforms where it does not work correctly.
+
+   Copyright 2022-2025 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <string.h>
+
+int
+rpl_chmod (const char *filename, mode_t mode)
+#undef chmod
+#if defined _WIN32 && !defined __CYGWIN__
+# define chmod _chmod
+#endif
+{
+  size_t len = strlen (filename);
+  if (len > 0 && filename[len - 1] == '/')
+    {
+      struct stat st;
+      if (lstat (filename, &st) < 0)
+        return -1;
+      if (!S_ISDIR (st.st_mode))
+        {
+          errno = ENOTDIR;
+          return -1;
+        }
+    }
+
+  return chmod (filename, mode);
+}