better libknot-2.4 fixup

lib/utils.c

@@ -26,6 +26,7 @@
 #include <libknot/dname.h>
 #include <libknot/rrtype/rrsig.h>
 #include <libknot/rrset-dump.h>
+#include <libknot/version.h>
 
 #include "lib/defines.h"
 #include "lib/utils.h"
@@ -509,9 +510,17 @@ char *kr_module_call(struct kr_context *ctx, const char *module, const char *pro
 
 void kr_rrset_print(const knot_rrset_t *rr)
 {
+#if KNOT_VERSION_HEX < ((2 << 16) | (4 << 8))
 	char rrtext[KNOT_DNAME_MAXLEN * 2] = {0};
 	knot_rrset_txt_dump(rr, rrtext, sizeof(rrtext), &KNOT_DUMP_STYLE_DEFAULT);
 	printf("%s", rrtext);
+#else
+	size_t size = 4000;
+	char *rrtext = malloc(size);
+	knot_rrset_txt_dump(rr, &rrtext, &size, &KNOT_DUMP_STYLE_DEFAULT);
+	printf("%s", rrtext);
+	free(rrtext);
+#endif
 }
 
 void kr_pkt_print(knot_pkt_t *pkt)

modules/cookies/cookiemonster.c

@@ -20,6 +20,7 @@
 #include <libknot/error.h>
 #include <libknot/mm_ctx.h>
 #include <libknot/rrtype/opt-cookie.h>
+#include <libknot/version.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -259,7 +260,11 @@ int check_response(kr_layer_t *ctx, knot_pkt_t *pkt)
 		return KR_STATE_FAIL;
 	}
 
+#if KNOT_VERSION_HEX >= ((2 << 16) | (4 << 8)) // just renamed function since 2.4.0
 	uint16_t rcode = knot_pkt_ext_rcode(pkt);
+#else
+	uint16_t rcode = knot_pkt_get_ext_rcode(pkt);
+#endif
 	if (rcode == KNOT_RCODE_BADCOOKIE) {
 		struct kr_query *next = NULL;
 		if (!(qry->flags & QUERY_BADCOOKIE_AGAIN)) {

modules/cookies/cookies.mk

 cookies_CFLAGS := -fvisibility=hidden -fPIC
-# Compat with libknot < 2.4; the identifier got renamed since 2.4.0.
-cookies_CFLAGS += $(shell pkg-config --atleast-version=2.4.0 libknot \
-				    || echo -Dknot_pkt_ext_rcode=knot_pkt_get_ext_rcode)
-
 cookies_SOURCES := \
 	modules/cookies/cookiectl.c \
 	modules/cookies/cookiemonster.c \