rtnl: headers in src/systemd/ may not include internal headers

Hence including "util.h" from sd-rtnl.h is not OK. Let's minimize our
headers we pull in a bit.

src/libsystemd-rtnl/rtnl-internal.h

@@ -21,6 +21,8 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <linux/netlink.h>
+
 #include "refcnt.h"
 
 struct sd_rtnl {

src/libsystemd-rtnl/rtnl-message.c

@@ -19,6 +19,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <linux/rtnetlink.h>
 #include <netinet/in.h>
 #include <netinet/ether.h>
 #include <stdbool.h>

src/libsystemd-rtnl/rtnl-util.c

@@ -19,6 +19,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <linux/rtnetlink.h>
 #include <netinet/ether.h>
 
 #include "sd-rtnl.h"

src/libsystemd-rtnl/rtnl-util.h

@@ -23,7 +23,14 @@
 
 #include <netinet/ether.h>
 
+#include "util.h"
 #include "sd-rtnl.h"
 
 int rtnl_set_link_name(sd_rtnl *rtnl, int ifindex, const char *name);
 int rtnl_set_link_properties(sd_rtnl *rtnl, int ifindex, const struct ether_addr *mac, unsigned mtu);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(sd_rtnl*, sd_rtnl_unref);
+DEFINE_TRIVIAL_CLEANUP_FUNC(sd_rtnl_message*, sd_rtnl_message_unref);
+
+#define _cleanup_sd_rtnl_unref_ _cleanup_(sd_rtnl_unrefp)
+#define _cleanup_sd_rtnl_message_unref_ _cleanup_(sd_rtnl_message_unrefp)

src/libsystemd-rtnl/sd-rtnl.c

@@ -27,6 +27,7 @@
 
 #include "sd-rtnl.h"
 #include "rtnl-internal.h"
+#include "rtnl-util.h"
 
 static int sd_rtnl_new(sd_rtnl **ret) {
         sd_rtnl *rtnl;

src/libsystemd-rtnl/test-rtnl.c

@@ -19,12 +19,14 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include <linux/rtnetlink.h>
 #include <netinet/ether.h>
 
 #include "util.h"
 #include "macro.h"
 #include "sd-rtnl.h"
 #include "socket-util.h"
+#include "rtnl-util.h"
 
 static void test_link_configure(sd_rtnl *rtnl, int ifindex) {
         _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *message;

src/systemd/sd-rtnl.h

@@ -21,10 +21,7 @@
 
 #pragma once
 
-#include <linux/rtnetlink.h>
-#include <linux/netlink.h>
-#include <stdint.h>
-#include <util.h>
+#include <inttypes.h>
 
 typedef struct sd_rtnl sd_rtnl;
 typedef struct sd_rtnl_message sd_rtnl_message;
@@ -54,9 +51,3 @@ sd_rtnl_message *sd_rtnl_message_unref(sd_rtnl_message *m);
 int sd_rtnl_message_get_type(sd_rtnl_message *m, uint16_t *type);
 int sd_rtnl_message_append(sd_rtnl_message *m, unsigned short type, const void *data);
 int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data);
-
-DEFINE_TRIVIAL_CLEANUP_FUNC(sd_rtnl*, sd_rtnl_unref);
-DEFINE_TRIVIAL_CLEANUP_FUNC(sd_rtnl_message*, sd_rtnl_message_unref);
-
-#define _cleanup_sd_rtnl_unref_ _cleanup_(sd_rtnl_unrefp)
-#define _cleanup_sd_rtnl_message_unref_ _cleanup_(sd_rtnl_message_unrefp)