+ mouse unit for go32v2: implement a 'hide count' for the custom drawn mouse
  cursor, so it behaves consistently with the cursor drawn by the int 33h
  mouse driver

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@28981 3ad0048d-3df7-0310-abae-a5850022a9f2