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

fusl/src/network/gethostbyname_r.c

Index: fusl/src/network/gethostbyname_r.c
diff --git a/fusl/src/network/gethostbyname_r.c b/fusl/src/network/gethostbyname_r.c
new file mode 100644
index 0000000000000000000000000000000000000000..cd8725417377284696d75344e8e679e14ae9cb7b
--- /dev/null
+++ b/fusl/src/network/gethostbyname_r.c
@@ -0,0 +1,11 @@
+#define _GNU_SOURCE
+
+#include <sys/socket.h>
+#include <netdb.h>
+
+int gethostbyname_r(const char *name,
+	struct hostent *h, char *buf, size_t buflen,
+	struct hostent **res, int *err)
+{
+	return gethostbyname2_r(name, AF_INET, h, buf, buflen, res, err);
+}