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

fusl/src/malloc/posix_memalign.c

Index: fusl/src/malloc/posix_memalign.c
diff --git a/fusl/src/malloc/posix_memalign.c b/fusl/src/malloc/posix_memalign.c
new file mode 100644
index 0000000000000000000000000000000000000000..cf67db63be0eb809335258c7fc8e39aa4236057c
--- /dev/null
+++ b/fusl/src/malloc/posix_memalign.c
@@ -0,0 +1,13 @@
+#include <stdlib.h>
+#include <errno.h>
+
+void *__memalign(size_t, size_t);
+
+int posix_memalign(void **res, size_t align, size_t len)
+{
+	if (align < sizeof(void *)) return EINVAL;
+	void *mem = __memalign(align, len);
+	if (!mem) return errno;
+	*res = mem;
+	return 0;
+}