codetools: reading fpc unit path: use working directory, not current directory

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45237 4005530d-fff6-0310-9dd1-cebe43e6787f
codetools: fpcunitset cache: do not expand file name, only normalize

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45238 4005530d-fff6-0310-9dd1-cebe43e6787f