Converter: Use defines just like in Delphi when simulating Delphi7.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41545 4005530d-fff6-0310-9dd1-cebe43e6787f
Codetools: revert the change in FixIncludeFilenames. It must be fixed properly later.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41546 4005530d-fff6-0310-9dd1-cebe43e6787f