Misc encryption enhancements

git-svn-id: svn://svn.code.sf.net/p/firebird/code/firebird/trunk@60302 65644016-39b1-43b1-bf79-96bc8fe82c15
Establish uncompressed connection in case of missing zlib

git-svn-id: svn://svn.code.sf.net/p/firebird/code/firebird/trunk@60303 65644016-39b1-43b1-bf79-96bc8fe82c15