util-lib: split out allocation calls into alloc-util.[ch]

src/libsystemd/sd-resolve/sd-resolve.c

@@ -33,6 +33,7 @@
 
 #include "sd-resolve.h"
 
+#include "alloc-util.h"
 #include "fd-util.h"
 #include "io-util.h"
 #include "list.h"

src/libsystemd/sd-resolve/test-resolve.c

@@ -30,6 +30,7 @@
 
 #include "sd-resolve.h"
 
+#include "alloc-util.h"
 #include "macro.h"
 #include "resolve-util.h"
 #include "socket-util.h"