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

fusl/src/ipc/msgrcv.c

Index: fusl/src/ipc/msgrcv.c
diff --git a/fusl/src/ipc/msgrcv.c b/fusl/src/ipc/msgrcv.c
new file mode 100644
index 0000000000000000000000000000000000000000..ed4a448a7e5e4f2993f99649345b0850529f9563
--- /dev/null
+++ b/fusl/src/ipc/msgrcv.c
@@ -0,0 +1,13 @@
+#include <sys/msg.h>
+#include "syscall.h"
+#include "ipc.h"
+#include "libc.h"
+
+ssize_t msgrcv(int q, void *m, size_t len, long type, int flag)
+{
+#ifdef SYS_msgrcv
+	return syscall_cp(SYS_msgrcv, q, m, len, type, flag);
+#else
+	return syscall_cp(SYS_ipc, IPCOP_msgrcv, q, len, flag, ((long[]){ (long)m, type }));
+#endif
+}