[PATCH] winnt.h: Provide inline NtCurrentTeb implementation for mingw arm builds.

[Jacek Caban]

Based on mingw-w64.

Signed-off-by: Jacek Caban 
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This fixes running on Windows executables built with Wine. I left 
non-mingw case unchanged so it doesn't depend on thread id register. 
Environments where it's not supported can't use PE files anyway.

include/winnt.h | 7 +++++++
  1 file changed, 7 insertions(+)