LibC: Add ss_family to sockaddr_storage

I'm not exactly sure if this is in the right spot in the structure,
especially since I read that this is supposed to be cast into other
structures.

Libraries/LibC/sys/socket.h

@@ -124,6 +124,7 @@ enum {
 #define SCM_TIMESTAMP SCM_TIMESTAMP
 
 struct sockaddr_storage {
+    sa_family_t ss_family;
     union {
         char data[sizeof(struct sockaddr_un)];
         void* alignment;