Compile fix for MSVC: Include <io.h>
Compile fix for MSVC: Include <io.h>

This include is needed for _commit(..) which is used in mingw.h.

Signed-off-by: Vincent van Ravesteijn <1c466654e4be28a1d0eae862fbfcbb6a3fd67387@lyx.org>
Acked-by: Erik Faye-Lund <2a8ffc07e8f57d80a2934ccc3dd1949354d82b2d@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git