* Preparation for Unicode RTL compilation

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24700 3ad0048d-3df7-0310-abae-a5850022a9f2
+ implemented dos.diskfree and disksize for i8086-msdos; cd-rom support not implemented yet

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24701 3ad0048d-3df7-0310-abae-a5850022a9f2