[PATCH 06/11] win32u: Introduce data-only mode in NtUserGetClipboardData.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
---
This makes it possible for drivers to handle clipboard without using 
client-side handles.

  dlls/win32u/clipboard.c | 19 +++++++++++++++----
  include/ntuser.h        |  1 +
  2 files changed, 16 insertions(+), 4 deletions(-)