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

fusl/arch/aarch64/bits/socket.h

Index: fusl/arch/aarch64/bits/socket.h
diff --git a/fusl/arch/aarch64/bits/socket.h b/fusl/arch/aarch64/bits/socket.h
new file mode 100644
index 0000000000000000000000000000000000000000..b3fe643ad8309f03f8ff0b1cbc9d3b5aa63ed345
--- /dev/null
+++ b/fusl/arch/aarch64/bits/socket.h
@@ -0,0 +1,35 @@
+#include <endian.h>
+
+struct msghdr
+{
+	void *msg_name;
+	socklen_t msg_namelen;
+	struct iovec *msg_iov;
+#if __BYTE_ORDER == __BIG_ENDIAN
+	int __pad1, msg_iovlen;
+#else
+	int msg_iovlen, __pad1;
+#endif
+	void *msg_control;
+#if __BYTE_ORDER == __BIG_ENDIAN
+	int __pad2;
+	socklen_t msg_controllen;
+#else
+	socklen_t msg_controllen;
+	int __pad2;
+#endif
+	int msg_flags;
+};
+
+struct cmsghdr
+{
+#if __BYTE_ORDER == __BIG_ENDIAN
+	int __pad1;
+	socklen_t cmsg_len;
+#else
+	socklen_t cmsg_len;
+	int __pad1;
+#endif
+	int cmsg_level;
+	int cmsg_type;
+};