Fix linking issue to directories in file module

The os.path.isdir() returns True for symlinks that point to directories,
so we also need to check to make sure it's not a symlink too.

Fixes #7657

library/files/file

@@ -182,7 +182,7 @@ def main():
 
     elif state in ['link','hard']:
 
-        if os.path.isdir(path):
+        if os.path.isdir(path) and not os.path.islink(path):
             relpath = path
         else:
             relpath = os.path.dirname(path)