Ignore SIGPIPE and allow EPIPE to get through to the program so that

we don't get stuck in a recursive loop trying to report a broken pipe
across that same broken pipe.  Debian bug #128632 (Colin Walters)

main.c

@@ -839,10 +839,13 @@ int main(int argc,char *argv[])
 	}
 
 	signal(SIGINT,SIGNAL_CAST sig_int);
-	signal(SIGPIPE,SIGNAL_CAST sig_int);
 	signal(SIGHUP,SIGNAL_CAST sig_int);
 	signal(SIGTERM,SIGNAL_CAST sig_int);
 
+	/* Ignore SIGPIPE; we consistently check error codes and will
+	 * see the EPIPE. */
+	signal(SIGPIPE, SIG_IGN);
+
 	/* Initialize push_dir here because on some old systems getcwd
 	   (implemented by forking "pwd" and reading its output) doesn't
 	   work when there are other child processes.  Also, on all systems