[PATCH] win32u: Implement NtUserBuildHwndList.

[Jacek Caban]

Fixes Quake Champions, spotted by Paul Gofman.

Signed-off-by: Jacek Caban 
---
  dlls/win32u/syscall.c            |  1 +
  dlls/win32u/tests/win32u.c       | 82 +++++++++++++++++++++++++++++++-
  dlls/win32u/win32u.spec          |  2 +-
  dlls/win32u/window.c             | 31 ++++++++++++
  dlls/wow64win/Makefile.in        |  2 +-
  dlls/wow64win/syscall.h          |  1 +
  dlls/wow64win/user.c             | 25 ++++++++++
  dlls/wow64win/wow64win_private.h |  2 +
  include/ntuser.h                 |  2 +
  9 files changed, 144 insertions(+), 4 deletions(-)