lazutils: FindDefaultExecutablePath: added default param BaseDir

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42361 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: further migration external tools

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42362 4005530d-fff6-0310-9dd1-cebe43e6787f