Fixed diagnostics

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58705 65644016-39b1-43b1-bf79-96bc8fe82c15
Avoid duplicated version check

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58706 65644016-39b1-43b1-bf79-96bc8fe82c15
Enable use of older version of autoconf

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58707 65644016-39b1-43b1-bf79-96bc8fe82c15
Misc diag

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@58708 65644016-39b1-43b1-bf79-96bc8fe82c15