Remove old shuffle header

libc/mem/shuffle.internal.h

@@ -1,21 +0,0 @@
-#ifndef COSMOPOLITAN_LIBC_RAND_SHUFFLE_H_
-#define COSMOPOLITAN_LIBC_RAND_SHUFFLE_H_
-#include "libc/intrin/xchg.h"
-
-/**
- * Fisher-Yates shuffle.
- *
- * @param R is a function like rand() → ≥0
- * @param A is a typed array
- * @param n is the number of items in A
- * @see ARRAYLEN()
- */
-#define shuffle(R, A, n)                      \
-  do {                                        \
-    autotype(A) Array = (A);                  \
-    for (size_t i = (n) - 1; i >= 1; --i) {   \
-      xchg(&Array[i], &Array[R() % (i + 1)]); \
-    }                                         \
-  } while (0)
-
-#endif /* COSMOPOLITAN_LIBC_RAND_SHUFFLE_H_ */