Make comparing of host name case-insensitive

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/branches/B2_5_Release@58893 65644016-39b1-43b1-bf79-96bc8fe82c15
Hope the last fix of nbackup host case insensitive cutting. Sorry.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/branches/B2_5_Release@58896 65644016-39b1-43b1-bf79-96bc8fe82c15