require and use chown with follow_symlinks=False

should be equivalent to using os.lchown() before.

(cherry picked from commit 094376a8ad)

borg/archive.py

@@ -472,7 +472,7 @@ Number of files: {0.stats.nfiles}'''.format(
             if fd:
                 os.fchown(fd, uid, gid)
             else:
-                os.lchown(path, uid, gid)
+                os.chown(path, uid, gid, follow_symlinks=False)
         except OSError:
             pass
         if fd:

borg/helpers.py

@@ -120,7 +120,7 @@ class PythonLibcTooOld(Error):
 
 
 def check_python():
-    required_funcs = {os.stat, os.utime}
+    required_funcs = {os.stat, os.utime, os.chown}
     if not os.supports_follow_symlinks.issuperset(required_funcs):
         raise PythonLibcTooOld