[PATCH 6/6] server: Block by waiting on context handle in get_thread_context.

[Jacek Caban]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=48052
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=45546
Signed-off-by: Jacek Caban 
---
  dlls/ntdll/thread.c | 35 ++++++++------------
  server/protocol.def |  5 ++-
  server/thread.c     | 78 ++++++++++++++++++++++++++++++++-------------
  3 files changed, 71 insertions(+), 47 deletions(-)