Remove hard-coded paths to system tools available in $PATH

This patch implemements a new feature of libite v1.9.1, whichp(), which
instead of fexist() that requires an absolute path, searches $PATH.

For reference, see issue #69 and PRs #70 and #72.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/service.c

@@ -148,17 +148,17 @@ static int service_start(svc_t *svc)
 	if (!svc)
 		return 1;
 
+	/* Ignore if finit is SIGSTOP'ed */
+	if (is_norespawn())
+		return 1;
+
 	/* Don't try and start service if it doesn't exist. */
-	if (!fexist(svc->cmd) && !svc->inetd.cmd) {
+	if (!whichp(svc->cmd) && !svc->inetd.cmd) {
 		print(1, "Service %s does not exist!", svc->cmd);
 		svc_missing(svc);
 		return 1;
 	}
 
-	/* Ignore if finit is SIGSTOP'ed */
-	if (is_norespawn())
-		return 1;
-
 	if (svc_is_daemon(svc) || svc_is_inetd(svc))
 		print_desc("Starting ", svc->desc);
 	else
@@ -284,7 +284,6 @@ static int service_start(svc_t *svc)
 #endif
 		if (svc->log)
 			waitpid(pid, NULL, 0);
-
 		exit(status);
 	} else if (log_is_debug()) {
 		char buf[CMD_SIZE] = "";