patch 8.0.1585: enabling beval_term feature in Win32 GUI

Problem:    Enabling beval_term feature in Win32 GUI.
Solution:   Only enable beval_term in Win32 console.
diff --git a/src/feature.h b/src/feature.h
index c80dc05..9754d0b 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -1318,7 +1318,8 @@
 /*
  * +balloon_eval_term	Allow balloon expression evaluation in the terminal.
  */
-#if defined(FEAT_HUGE) && (defined(UNIX) || defined(WIN32)) && defined(FEAT_TIMERS)
+#if defined(FEAT_HUGE) && defined(FEAT_TIMERS) && \
+	(defined(UNIX) || (defined(WIN32) && !defined(FEAT_GUI_W32)))
 # define FEAT_BEVAL_TERM
 #endif