conf-parser: Reduce transitive includes

src/resolve/resolved-dns-stub.c

@@ -3,6 +3,7 @@
 #include <net/if_arp.h>
 #include <netinet/tcp.h>
 
+#include "alloc-util.h"
 #include "capability-util.h"
 #include "dns-type.h"
 #include "errno-util.h"

src/resolve/resolved-dnssd.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include "alloc-util.h"
 #include "conf-files.h"
 #include "conf-parser.h"
 #include "constants.h"

src/resolve/resolved-etc-hosts.c

@@ -4,6 +4,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "alloc-util.h"
 #include "dns-domain.h"
 #include "fd-util.h"
 #include "fileio.h"

src/resolve/resolved-socket-graveyard.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include "alloc-util.h"
 #include "resolved-manager.h"
 #include "resolved-socket-graveyard.h"
 

src/resolve/resolved-varlink.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 
+#include "alloc-util.h"
 #include "bus-polkit.h"
 #include "dns-domain.h"
 #include "dns-type.h"