After removing collation for [a-z] ranges in r302512, do it here too.

Instead of trying to expand whole range at regcomp() stage as we do,
GNU regex allocates separate ranges [start,end] set each character
is checked against, so collation is possible and turned on for ranges here.

When something like that will be implemented or our obsoleted regex code
will be replaced to something like TRE, and in case we decide to use
collation in [a-z] ranges, all changes related to r302512 can be backed out,
but now we need consistency.

contrib/libgnuregex/regcomp.c

@@ -2664,7 +2664,11 @@ build_range_exp (bitset_t sbcset, bracket_elem_t *start_elem,
       return REG_ECOLLATE;
     cmp_buf[0] = start_wc;
     cmp_buf[4] = end_wc;
+#ifdef __FreeBSD__
+    if (wcscmp (cmp_buf, cmp_buf + 4) > 0)
+#else
     if (wcscoll (cmp_buf, cmp_buf + 4) > 0)
+#endif
       return REG_ERANGE;
 
     /* Got valid collation sequence values, add them as a new entry.
@@ -2706,8 +2710,13 @@ build_range_exp (bitset_t sbcset, bracket_elem_t *start_elem,
     for (wc = 0; wc < SBC_MAX; ++wc)
       {
 	cmp_buf[2] = wc;
+#ifdef __FreeBSD__
+	if (wcscmp (cmp_buf, cmp_buf + 2) <= 0
+	    && wcscmp (cmp_buf + 2, cmp_buf + 4) <= 0)
+#else
 	if (wcscoll (cmp_buf, cmp_buf + 2) <= 0
 	    && wcscoll (cmp_buf + 2, cmp_buf + 4) <= 0)
+#endif
 	  bitset_set (sbcset, wc);
       }
   }

contrib/libgnuregex/regexec.c

@@ -3964,8 +3964,13 @@ check_node_accept_bytes (const re_dfa_t *dfa, int node_idx,
 	    {
 	      cmp_buf[0] = cset->range_starts[i];
 	      cmp_buf[4] = cset->range_ends[i];
+#ifdef __FreeBSD__
+	      if (wcscmp (cmp_buf, cmp_buf + 2) <= 0
+		  && wcscmp (cmp_buf + 2, cmp_buf + 4) <= 0)
+#else
 	      if (wcscoll (cmp_buf, cmp_buf + 2) <= 0
 		  && wcscoll (cmp_buf + 2, cmp_buf + 4) <= 0)
+#endif
 		{
 		  match_len = char_len;
 		  goto check_node_accept_bytes_match;