FpDbg: Fixed problem with uninitialized variable

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44491 4005530d-fff6-0310-9dd1-cebe43e6787f
FpDbg: Disasemble on non-Windows systems

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44492 4005530d-fff6-0310-9dd1-cebe43e6787f