(posix_accept, posix_bind, posix_listen, posix_setsockopt,

posix_shutdown, posix_socket, socklen_t) [_WIN32]: Move socket
related externs to sys/socket.h.

(inet_ntop) [_WIN32]: Move extern to inet.h.

(tcp_listen): Remove the !WIN32 includes and use the revised
sys/socket.h, netinet/in.h, arpa/inet.h and netdb.h.

src/lib/gen/tcp_listen.c

@@ -40,11 +40,9 @@
 #include <string.h>
 #include <sys/types.h>
 #include <sys/socket.h>
-#if !defined(_WIN32)
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <netdb.h>
-#endif
 #include <unistd.h>
 #include "prototypes.h"