Set OPENSSL_* variables to empty string if not found
Set OPENSSL_* variables to empty string if not found

mfontanini/libtins,rklabs/libtins,viveks9/decrypt80211,mfontanini/libtins,UlfWetzker/libtins,rklabs/libtins,viveks9/decrypt80211,UlfWetzker/libtins