updated for version 7.3.240
Problem:    External commands can't use pipes on MS-Windows.
Solution:   Implement pipes and use them when 'shelltemp' isn't set. (Vincent
            Berthoux)
diff --git a/src/ui.c b/src/ui.c
index 82d83d3..3b0ae72 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -58,7 +58,7 @@
 #endif
 }
 
-#if defined(UNIX) || defined(VMS) || defined(PROTO)
+#if defined(UNIX) || defined(VMS) || defined(PROTO) || defined(WIN3264)
 /*
  * When executing an external program, there may be some typed characters that
  * are not consumed by it.  Give them back to ui_inchar() and they are stored