Do not define AcceptPIDFromInferior when it will not be used

Author: vedantk

lldb/source/Host/macosx/objcxx/Host.mm

@@ -136,6 +136,8 @@
   return false;
 }
 
+#if !NO_XPC_SERVICES
+
 static void *AcceptPIDFromInferior(void *arg) {
   const char *connect_url = (const char *)arg;
   ConnectionFileDescriptor file_conn;
@@ -154,8 +156,6 @@
   return NULL;
 }
 
-#if !NO_XPC_SERVICES
-
 const char *applscript_in_new_tty = "tell application \"Terminal\"\n"
                                     "   activate\n"
                                     "	do script \"/bin/bash -c '%s';exit\"\n"