kernel32: Implement GetThreadId.

[Robert Shearman]

---
  dlls/kernel32/kernel32.spec |    1 +
  dlls/kernel32/thread.c      |   30 ++++++++++++++++++++++++++++++
  include/winbase.h           |    1 +
  3 files changed, 32 insertions(+), 0 deletions(-)

Re-diffed so that the include/winbase.h changes now apply.

This function is implemented on Vista, but is useful for Wine DLLs.
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