+ implemented dos.GetIntVec and SetIntVec for i8086-msdos

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24720 3ad0048d-3df7-0310-abae-a5850022a9f2
+ added and implemented unit ports for i8086-msdos

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24722 3ad0048d-3df7-0310-abae-a5850022a9f2