winex11drv: Grub pointer in suitable window in ClipCursor

[Vitaliy Margolen]

If clip rectangle specifies a none empty rectangle that is smaller then the
whole screen grab the pointer if we can find the window that clip rectangle
entirely fits in.

Changes from last try:
- If the window belongs to another thread - send internal message instead of
failing.
- Store grabbed window's hwnd in a global variable so we can ungrab it.
---
 dlls/winex11.drv/event.c  |    2 +
 dlls/winex11.drv/mouse.c  |   60 +++++++++++++++++++++++++++++++++++++++++++++
 dlls/winex11.drv/x11drv.h |    3 +-
 3 files changed, 64 insertions(+), 1 deletions(-)
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