patch 8.1.1724: too much overhead checking for CTRL-C while processing text

Problem:    Too much overhead checking for CTRL-C while processing text.
Solution:   Increase BREAKCHECK_SKIP.  Remove the difference for when built
            with the GUI. (suggested by Andy Massimino, closes #4708)
diff --git a/src/misc1.c b/src/misc1.c
index f5549fd..7df3954 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -3182,11 +3182,7 @@
  */
 
 #ifndef BREAKCHECK_SKIP
-# ifdef FEAT_GUI		    /* assume the GUI only runs on fast computers */
-#  define BREAKCHECK_SKIP 200
-# else
-#  define BREAKCHECK_SKIP 32
-# endif
+# define BREAKCHECK_SKIP 1000
 #endif
 
 static int	breakcheck_count = 0;