Update VisualStudio 20xx building notes README 


git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@57921 65644016-39b1-43b1-bf79-96bc8fe82c15
Cleanup mingw build instructions , todo add up to date instructions with ming-w64 http://mingw-w64.sourceforge.net/ used for qt , boost ... http://qt-project.org/wiki/MinGW


git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@57922 65644016-39b1-43b1-bf79-96bc8fe82c15