[Minor] Save 8 bytes in rspamd_regexp_t

src/libutil/regexp.c

 	gint flags;
 	gint pcre_flags;
 	gint ncaptures;
-	gint nbackref;
 };
 
 struct rspamd_regexp_cache {
 			&ncaptures) == 0) {
 		res->ncaptures = ncaptures;
 	}
-
-	/* Check number of backrefs */
-	if (pcre_fullinfo (res->raw_re, res->extra, PCRE_INFO_BACKREFMAX,
-			&ncaptures) == 0) {
-		res->nbackref = ncaptures;
-	}
 #else
 	/* Check number of captures */
 	if (pcre2_pattern_info (res->raw_re, PCRE2_INFO_CAPTURECOUNT,
 			&ncaptures) == 0) {
 		res->ncaptures = ncaptures;
 	}
-
-	/* Check number of backrefs */
-	if (pcre2_pattern_info (res->raw_re, PCRE2_INFO_BACKREFMAX,
-			&ncaptures) == 0) {
-		res->nbackref = ncaptures;
-	}
 #endif
 
 	return res;
 	return re->pcre_flags;
 }
 
-gint
-rspamd_regexp_get_nbackrefs (const rspamd_regexp_t *re)
-{
-	g_assert (re != NULL);
-
-	return re->nbackref;
-}
-
-gint
-rspamd_regexp_get_ncaptures (const rspamd_regexp_t *re)
-{
-	g_assert (re != NULL);
-
-	return re->ncaptures;
-}
-
 guint
 rspamd_regexp_get_maxhits (const rspamd_regexp_t *re)
 {

src/libutil/regexp.h

  */
 guint rspamd_regexp_set_maxhits (rspamd_regexp_t *re, guint new_maxhits);
 
-/**
- * Returns number of backreferences in a regexp
- */
-gint rspamd_regexp_get_nbackrefs (const rspamd_regexp_t *re);
-
-/**
- * Returns number of capture groups in a regexp
- */
-gint rspamd_regexp_get_ncaptures (const rspamd_regexp_t *re);
-
 /**
  * Returns cache id for a regexp
  */