Add a "fork" of musl as //fusl.

fusl/src/network/inet_legacy.c

+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+in_addr_t inet_network(const char *p)
+{
+        return ntohl(inet_addr(p));
+}
+
+struct in_addr inet_makeaddr(in_addr_t n, in_addr_t h)
+{
+        if (n < 256) h |= n<<24;
+        else if (n < 65536) h |= n<<16;
+        else h |= n<<8;
+        return (struct in_addr){ h };
+}
+
+in_addr_t inet_lnaof(struct in_addr in)
+{
+        uint32_t h = in.s_addr;
+        if (h>>24 < 128) return h & 0xffffff;
+        if (h>>24 < 192) return h & 0xffff;
+        return h & 0xff;
+}
+
+in_addr_t inet_netof(struct in_addr in)
+{
+        uint32_t h = in.s_addr;
+        if (h>>24 < 128) return h >> 24;
+        if (h>>24 < 192) return h >> 16;
+        return h >> 8;
+}