Remove bf_cbc.c

It is never built and the code is duplicated in bf_enc.c.
Reviewed-by: NEmilia Käsper <emilia@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2778)

crypto/bf/bf_cbc.c

-/*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (the "License").  You may not use
- * this file except in compliance with the License.  You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
-
-#include <openssl/blowfish.h>
-#include "bf_locl.h"
-
-void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
-                    const BF_KEY *schedule, unsigned char *ivec, int encrypt)
-{
-    register BF_LONG tin0, tin1;
-    register BF_LONG tout0, tout1, xor0, xor1;
-    register long l = length;
-    BF_LONG tin[2];
-
-    if (encrypt) {
-        n2l(ivec, tout0);
-        n2l(ivec, tout1);
-        ivec -= 8;
-        for (l -= 8; l >= 0; l -= 8) {
-            n2l(in, tin0);
-            n2l(in, tin1);
-            tin0 ^= tout0;
-            tin1 ^= tout1;
-            tin[0] = tin0;
-            tin[1] = tin1;
-            BF_encrypt(tin, schedule);
-            tout0 = tin[0];
-            tout1 = tin[1];
-            l2n(tout0, out);
-            l2n(tout1, out);
-        }
-        if (l != -8) {
-            n2ln(in, tin0, tin1, l + 8);
-            tin0 ^= tout0;
-            tin1 ^= tout1;
-            tin[0] = tin0;
-            tin[1] = tin1;
-            BF_encrypt(tin, schedule);
-            tout0 = tin[0];
-            tout1 = tin[1];
-            l2n(tout0, out);
-            l2n(tout1, out);
-        }
-        l2n(tout0, ivec);
-        l2n(tout1, ivec);
-    } else {
-        n2l(ivec, xor0);
-        n2l(ivec, xor1);
-        ivec -= 8;
-        for (l -= 8; l >= 0; l -= 8) {
-            n2l(in, tin0);
-            n2l(in, tin1);
-            tin[0] = tin0;
-            tin[1] = tin1;
-            BF_decrypt(tin, schedule);
-            tout0 = tin[0] ^ xor0;
-            tout1 = tin[1] ^ xor1;
-            l2n(tout0, out);
-            l2n(tout1, out);
-            xor0 = tin0;
-            xor1 = tin1;
-        }
-        if (l != -8) {
-            n2l(in, tin0);
-            n2l(in, tin1);
-            tin[0] = tin0;
-            tin[1] = tin1;
-            BF_decrypt(tin, schedule);
-            tout0 = tin[0] ^ xor0;
-            tout1 = tin[1] ^ xor1;
-            l2nn(tout0, tout1, out, l + 8);
-            xor0 = tin0;
-            xor1 = tin1;
-        }
-        l2n(xor0, ivec);
-        l2n(xor1, ivec);
-    }
-    tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
-    tin[0] = tin[1] = 0;
-}