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

fusl/src/network/recvmsg.c

Index: fusl/src/network/recvmsg.c
diff --git a/fusl/src/network/recvmsg.c b/fusl/src/network/recvmsg.c
new file mode 100644
index 0000000000000000000000000000000000000000..4f526659183defd2405ed6961b8ccca9e8ded1f5
--- /dev/null
+++ b/fusl/src/network/recvmsg.c
@@ -0,0 +1,22 @@
+#include <sys/socket.h>
+#include <limits.h>
+#include "syscall.h"
+#include "libc.h"
+
+ssize_t recvmsg(int fd, struct msghdr *msg, int flags)
+{
+	ssize_t r;
+#if LONG_MAX > INT_MAX
+	struct msghdr h, *orig = msg;
+	if (msg) {
+		h = *msg;
+		h.__pad1 = h.__pad2 = 0;
+		msg = &h;
+	}
+#endif
+	r = socketcall_cp(recvmsg, fd, msg, flags, 0, 0, 0);
+#if LONG_MAX > INT_MAX
+	if (orig) *orig = h;
+#endif
+	return r;
+}