remove SSL_OP_MSIE_SSLV2_RSA_PADDING

According to the header it has had "no effect since 0.9.7h and 0.9.8b", but more importantly they decided to re-use the constant value (huh?) in an upcoming OpenSSL release so anyone running bleeding edge will get an undeclared error on the old name. This fixes #350

To see the commit where they reused the define:
https://github.com/openssl/openssl/commit/dece3209f299ebcd82414868ee39b2c6feb3be0a