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

fusl/src/ipc/shmctl.c

Index: fusl/src/ipc/shmctl.c
diff --git a/fusl/src/ipc/shmctl.c b/fusl/src/ipc/shmctl.c
new file mode 100644
index 0000000000000000000000000000000000000000..e2879f20aa8009e15f4b0851a9bf749f4e3dd4ad
--- /dev/null
+++ b/fusl/src/ipc/shmctl.c
@@ -0,0 +1,12 @@
+#include <sys/shm.h>
+#include "syscall.h"
+#include "ipc.h"
+
+int shmctl(int id, int cmd, struct shmid_ds *buf)
+{
+#ifdef SYS_shmctl
+	return syscall(SYS_shmctl, id, cmd | IPC_64, buf);
+#else
+	return syscall(SYS_ipc, IPCOP_shmctl, id, cmd | IPC_64, 0, buf, 0);
+#endif
+}