Revert "Use vfork() instead of fork() before exec()"

This reverts commit 074686b520.  Which
turned out to not work so well after all.  For instance, launching TTYs
in a background process completely blocked inetd services from even
starting up listening sockets ... proper fork seems to work fine though.

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

svc.c

@@ -533,7 +533,7 @@ int svc_start(svc_t *svc)
 	sigaddset(&nmask, SIGCHLD);
 	sigprocmask(SIG_BLOCK, &nmask, &omask);
 
-	pid = vfork();
+	pid = fork();
 	sigprocmask(SIG_SETMASK, &omask, NULL);
 	if (pid == 0) {
 		int i = 0;