evptests.txt: add XTS test vectors
dest4-sparcv9.pl: add clarification comment.
gcm128.c: fix linking problems in 32-bit Windows build.
e_aes.c: reserve for future extensions.
aesni-x86_64.pl: optimize CBC decrypt.

Give CBC decrypt approximately same treatment as to CTR and collect 25%.
cryptlib.c: fix typo in OPENSSL_showfatal.