+ fully implemented ParamStr and ParamCount on i8086-msdos

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24582 3ad0048d-3df7-0310-abae-a5850022a9f2
* fixed a regression, introduced in r24571

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24583 3ad0048d-3df7-0310-abae-a5850022a9f2