amunits: syscallified IFFParse

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28604 3ad0048d-3df7-0310-abae-a5850022a9f2
amunits: syscallified Input

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28605 3ad0048d-3df7-0310-abae-a5850022a9f2