patch 8.1.1306: Borland support is outdated and doesn't work

Problem:    Borland support is outdated and doesn't work.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)

src/spellfile.c

@@ -4802,19 +4802,12 @@ node_equal(wordnode_T *n1, wordnode_T *n2)
     return p1 == NULL && p2 == NULL;
 }
 
-static int
-#ifdef __BORLANDC__
-_RTLENTRYF
-#endif
-rep_compare(const void *s1, const void *s2);
+static int rep_compare(const void *s1, const void *s2);
 
 /*
  * Function given to qsort() to sort the REP items on "from" string.
  */
     static int
-#ifdef __BORLANDC__
-_RTLENTRYF
-#endif
 rep_compare(const void *s1, const void *s2)
 {
     fromto_T	*p1 = (fromto_T *)s1;