patch 9.0.1341: build error with mzscheme but without GUI

Problem:    Build error with mzscheme but without GUI.
Solution:   Adjust #ifdefs. (Ken Takata, closes #12042)  Also fix function
            argument.

src/if_mzsch.c

@@ -886,19 +886,21 @@ remove_timer(void)
     timer_id = 0;
 }
 
+#endif // MZSCHEME_GUI_THREADS
+
     char *
-did_set_mzquantum(void)
+did_set_mzquantum(optset_T *args UNUSED)
 {
+#if defined(MZSCHEME_GUI_THREADS)
     // reset timer
     if (timer_id != 0)
 	remove_timer();
     if (mz_threads_allow && p_mzq > 0 && gui.in_use)
 	setup_timer();
+#endif
     return NULL;
 }
 
-#endif // MZSCHEME_GUI_THREADS
-
     static void
 notify_multithread(int on)
 {

src/proto/if_mzsch.pro

@@ -1,7 +1,7 @@
 /* if_mzsch.c */
 int mzscheme_enabled(int verbose);
 void mzvim_check_threads(void);
-char *did_set_mzquantum(void);
+char *did_set_mzquantum(optset_T *args);
 void mzscheme_end(void);
 int mzscheme_main(void);
 void mzscheme_buffer_free(buf_T *buf);

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1341,
 /**/
     1340,
 /**/