remove SSL_OP_MSIE_SSLV2_RSA_PADDING

According to the header it ahs had "no effect singe 0.9.7h and 0.9.8b"
but more importantly they decided to re-use the constant (wtf?) in an
upcoming OpenSSL release so anybody running bleeding edge will get an
undefined symbol

To see the commit where they reused the define:
https://github.com/openssl/openssl/commit/dece3209f299ebcd82414868ee39b2c6feb3be0a
Merge pull request #351 from reaperhulk/remove-old-constant

remove SSL_OP_MSIE_SSLV2_RSA_PADDING