* first part of UnicodeStringManager routines implementation for OS/2

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@29178 3ad0048d-3df7-0310-abae-a5850022a9f2
  * minor update of the GetLastOSError support infrastructure

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@29179 3ad0048d-3df7-0310-abae-a5850022a9f2