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

fusl/src/network/gethostbyaddr.c

Index: fusl/src/network/gethostbyaddr.c
diff --git a/fusl/src/network/gethostbyaddr.c b/fusl/src/network/gethostbyaddr.c
new file mode 100644
index 0000000000000000000000000000000000000000..598e2241a9f808e8ecafb72e24d7d6959cb49a28
--- /dev/null
+++ b/fusl/src/network/gethostbyaddr.c
@@ -0,0 +1,24 @@
+#define _GNU_SOURCE
+
+#include <netdb.h>
+#include <errno.h>
+#include <stdlib.h>
+
+struct hostent *gethostbyaddr(const void *a, socklen_t l, int af)
+{
+	static struct hostent *h;
+	size_t size = 63;
+	struct hostent *res;
+	int err;
+	do {
+		free(h);
+		h = malloc(size+=size+1);
+		if (!h) {
+			h_errno = NO_RECOVERY;
+			return 0;
+		}
+		err = gethostbyaddr_r(a, l, af, h,
+			(void *)(h+1), size-sizeof *h, &res, &h_errno);
+	} while (err == ERANGE);
+	return err ? 0 : h;
+}