Fix compilation with 2.6.x.

rtl/inc/rtti.inc:
  * RecordRTTI: don't check for IsWeak field for 2.6.x
  * fpc_copy: assume IsWeak as False for 2.6.x


git-svn-id: http://svn.freepascal.org/svn/fpc/branches/svenbarth@28873 3ad0048d-3df7-0310-abae-a5850022a9f2
Fix compilation with 2.6.x.

rtl/inc/objpash.inc:
  * TVmt: don't include the reference count offset field in the VMT for 2.6.x.


git-svn-id: http://svn.freepascal.org/svn/fpc/branches/svenbarth@28874 3ad0048d-3df7-0310-abae-a5850022a9f2