Allow --no-verify to bypass commit-msg hook

At the moment the --no-verify switch to "git commit" instructs it to
skip over the pre-commit hook. Here we teach "git commit --no-verify"
to skip over the commit-msg hook as well. This brings the behaviour
of builtin-commit back in line with git-commit.sh.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-commit.c

@@ -792,7 +792,8 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 		rollback_index_files();
 		die("could not read commit message");
 	}
-	if (run_hook(index_file, "commit-msg", git_path(commit_editmsg))) {
+	if (!no_verify &&
+	    run_hook(index_file, "commit-msg", git_path(commit_editmsg))) {
 		rollback_index_files();
 		exit(1);
 	}