patch 8.1.1306: Borland support is outdated and doesn't work

Problem:    Borland support is outdated and doesn't work.
Solution:   Remove Borland support, there are other (free) compilers
            available. (Thomas Dziedzic, Ken Takata, closes #4364)
diff --git a/src/spell.c b/src/spell.c
index 947bee5..8f32fd7 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -6760,20 +6760,13 @@
     }
 }
 
-static int
-#ifdef __BORLANDC__
-_RTLENTRYF
-#endif
-sug_compare(const void *s1, const void *s2);
+static int sug_compare(const void *s1, const void *s2);
 
 /*
  * Function given to qsort() to sort the suggestions on st_score.
  * First on "st_score", then "st_altscore" then alphabetically.
  */
     static int
-#ifdef __BORLANDC__
-_RTLENTRYF
-#endif
 sug_compare(const void *s1, const void *s2)
 {
     suggest_T	*p1 = (suggest_T *)s1;