* Install extra files relative to $(prefix) instead of $(baseinstalldir). This way yylex.cod and yyparse.cod can be installed without using a absolute path (Not possible in archives)

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28945 3ad0048d-3df7-0310-abae-a5850022a9f2