Don't modify things if we are using vfork as this is very bad and may cause unexpected behavior (issue #7970 reported by Nick Gavrikov)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@45595 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/asterisk.c

@@ -690,7 +690,9 @@ void ast_unreplace_sigchld(void)
 int ast_safe_system(const char *s)
 {
 	pid_t pid;
+#ifdef HAVE_WORKING_FORK
 	int x;
+#endif
 	int res;
 	struct rusage rusage;
 	int status;
@@ -705,11 +707,13 @@ int ast_safe_system(const char *s)
 #endif	
 
 	if (pid == 0) {
+#ifdef HAVE_WORKING_FORK
 		if (ast_opt_high_priority)
 			ast_set_priority(0);
 		/* Close file descriptors and launch system command */
 		for (x = STDERR_FILENO + 1; x < 4096; x++)
 			close(x);
+#endif
 		execl("/bin/sh", "/bin/sh", "-c", s, (char *) NULL);
 		exit(1);
 	} else if (pid > 0) {