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)

src/feature.h

@@ -483,6 +483,11 @@
 # define FEAT_TEXT_PROP
 #endif
 
+#if defined(FEAT_SYN_HL) && defined(FEAT_RELTIME)
+// Can limit syntax highlight time to 'redrawtime'.
+# define SYN_TIME_LIMIT 1
+#endif
+
 /*
  * +spell		spell checking
  *

src/misc1.c

@@ -3182,11 +3182,7 @@ vim_fexists(char_u *fname)
  */
 
 #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;

src/screen.c

@@ -167,11 +167,6 @@ static void win_redr_ruler(win_T *wp, int always, int ignore_pum);
 /* Ugly global: overrule attribute used by screen_char() */
 static int screen_char_attr = 0;
 
-#if defined(FEAT_SYN_HL) && defined(FEAT_RELTIME)
-/* Can limit syntax highlight time to 'redrawtime'. */
-# define SYN_TIME_LIMIT 1
-#endif
-
 #ifdef FEAT_RIGHTLEFT
 # define HAS_RIGHTLEFT(x) x
 #else

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1724,
 /**/
     1723,
 /**/