AROS: Syscall-ified util and dos library

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28522 3ad0048d-3df7-0310-abae-a5850022a9f2
 * apply patch from issue 26635, dealing with exe extension.


git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28523 3ad0048d-3df7-0310-abae-a5850022a9f2
amunits: fixed exec unit to actually build...

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28524 3ad0048d-3df7-0310-abae-a5850022a9f2