Silence a few warnings.

libc/inet/getnetent.c

@@ -15,6 +15,8 @@
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
+#define __FORCE_GLIBC__
+#include <features.h>
 #include <stdio.h>
 #include <netdb.h>
 #include <arpa/inet.h>

libc/inet/inet_net.c

@@ -32,6 +32,8 @@
  * SUCH DAMAGE.
  */
 
+#define __FORCE_GLIBC__
+#include <features.h>
 #include <ctype.h>
 #include <netinet/in.h>
 

libc/inet/ntop.c

@@ -15,6 +15,8 @@
  * SOFTWARE.
  */
 
+#define __FORCE_GLIBC__
+#include <features.h>
 #include <sys/param.h>
 #include <sys/types.h>
 #include <sys/socket.h>

libc/inet/socketcalls.c

@@ -83,7 +83,7 @@ int getsockopt(int fd, int level, int optname, __ptr_t optval,
 #endif
 
 #ifdef L_listen
-int listen(int sockfd, unsigned int backlog)
+int listen(int sockfd, int backlog)
 {
 	unsigned long args[2];