tree-wide: drop socket.h when socket-util.h is included

src/shared/ask-password-api.c

@@ -13,7 +13,6 @@
 #include <stdlib.h>
 #include <sys/inotify.h>
 #include <sys/signalfd.h>
-#include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/uio.h>

src/shared/firewall-util.c

@@ -10,7 +10,6 @@
 #include <errno.h>
 #include <stddef.h>
 #include <string.h>
-#include <sys/socket.h>
 #include <net/if.h>
 #ifndef IFNAMSIZ
 #define IFNAMSIZ 16