tag: don't check .hgtags status if --local passed

Local tags don't create a commit, so we don't need to check the status
of .hgtags.

mercurial/localrepo.py

@@ -296,6 +296,7 b' class localrepository(repo.repository):'
 
         date: date tuple to use if committing'''
 
+        if not local:
         for x in self.status()[:5]:
             if '.hgtags' in x:
                 raise util.Abort(_('working copy of .hgtags is changed '

tests/test-tag.t

@@ -196,3 +196,15 b' test custom commit messages'
   $ hg log -l1 --template "{desc}\n"
   custom tag message
   second line
+
+local tag with .hgtags modified
+
+  $ hg tag hgtags-modified
+  $ hg rollback
+  rolling back to revision 11 (undo commit)
+  $ hg st
+  M .hgtags
+  ? .hgtags.orig
+  ? editor
+  $ hg tag --local baz
+  $ hg revert --no-backup .hgtags