patch 8.1.0719: too many #ifdefs

Problem:    Too many #ifdefs.
Solution:   Always build with the +visualextra feature.
diff --git a/src/feature.h b/src/feature.h
index 5c03e2b..a2bb217 100644
--- a/src/feature.h
+++ b/src/feature.h
@@ -194,10 +194,8 @@
 /*
  * +visual		Visual mode - now always included.
  * +visualextra		Extra features for Visual mode (mostly block operators).
+ *			Now always included.
  */
-#ifdef FEAT_NORMAL
-# define FEAT_VISUALEXTRA
-#endif
 
 /*
  * +virtualedit		'virtualedit' option and its implementation