patch 8.2.1336: build failure on non-Unix systems

Problem:    Build failure on non-Unix systems.
Solution:   Add #ifdef.

src/gui.c

@@ -5588,7 +5588,10 @@ check_for_interrupt(int key, int modifiers_arg)
     int c = merge_modifyOtherKeys(key, &modifiers);
 
     if ((c == Ctrl_C && ctrl_c_interrupts)
-	    || (intr_char != Ctrl_C && c == intr_char))
+#ifdef UNIX
+	    || (intr_char != Ctrl_C && c == intr_char)
+#endif
+	    )
     {
 	got_int = TRUE;
 	return c;

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1336,
 /**/
     1335,
 /**/