builtin-commit: make summary output consistent with status

This enables -B -M to the summary output after a commit is made so that
it is in line with what is shown in git-status and commit log template.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-commit.c

@@ -662,6 +662,9 @@ static void print_summary(const char *prefix, const unsigned char *sha1)
 	rev.show_root_diff = 1;
 	rev.commit_format = get_commit_format("format:%h: %s");
 	rev.always_show_header = 0;
+	rev.diffopt.detect_rename = 1;
+	rev.diffopt.rename_limit = 100;
+	rev.diffopt.break_opt = 0;
 	diff_setup_done(&rev.diffopt);
 
 	printf("Created %scommit ", initial_commit ? "initial " : "");