+ implemented dos.GetShortName and GetLongName for i8086-msdos

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24699 3ad0048d-3df7-0310-abae-a5850022a9f2
* Preparation for Unicode RTL compilation

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24700 3ad0048d-3df7-0310-abae-a5850022a9f2