[PATCH 4/7] win32u: Move IsWindowEnabled implementation from user32.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
---
We technically don't really need to expose it from win32u, but then we'd 
need to duplicate it both for win32u internals and drivers, so that 
seems cleaner.

  dlls/user32/win.c    |  9 ++-------
  dlls/win32u/window.c | 13 +++++++++++++
  include/ntuser.h     |  1 +
  3 files changed, 16 insertions(+), 7 deletions(-)