SPARC T4 assembly pack: treat zero input length in CBC.

The problem is that OpenSSH calls EVP_Cipher, which is not as
protective as EVP_CipherUpdate. Formally speaking we ought to
do more checks in *_cipher methods, including rejecting
lengths not divisible by block size (unless ciphertext stealing
is in place). But for now I implement check for zero length in
low-level based on precedent.

PR: 3087, 2775
(cherry picked from commit 5e44c144e649a53bae2724b34d908f6cb26b01ed)
engines/ccgost/gosthash.c: simplify and avoid SEGV.

PR: 3275
(cherry picked from commit ea38f020492042bc1d1adc26ef197b0b9cadf968)
Remove -WX option from debug-VC-WIN32
(cherry picked from commit 7a3e67f029969620966b8a627b8485d83692cca5)