always use fork() when available

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43216 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/asterisk.c

@@ -698,10 +698,10 @@ int ast_safe_system(const char *s)
 #if defined(HAVE_WORKING_FORK) || defined(HAVE_WORKING_VFORK)
 	ast_replace_sigchld();
 
-#ifdef HAVE_WORKING_VFORK
+#ifdef HAVE_WORKING_FORK
-	pid = vfork();
-#else
 	pid = fork();
+#else
+	pid = vfork();
 #endif	
 
 	if (pid == 0) {