run-command: do not warn about child death from terminal

SIGINT and SIGQUIT are not generally interesting signals to
the user, since they are typically caused by them hitting "^C"
or otherwise telling their terminal to send the signal.
Signed-off-by: NJeff King <peff@peff.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

run-command.c

@@ -242,7 +242,8 @@ static int wait_or_whine(pid_t pid, const char *argv0)
 		error("waitpid is confused (%s)", argv0);
 	} else if (WIFSIGNALED(status)) {
 		code = WTERMSIG(status);
-		error("%s died of signal %d", argv0, code);
+		if (code != SIGINT && code != SIGQUIT)
+			error("%s died of signal %d", argv0, code);
 		/*
 		 * This return value is chosen so that code & 0xff
 		 * mimics the exit code that a POSIX shell would report for