Cygwin x86_64 support.
Cygwin x86_64 support.

This should have been taken into account at 64347a10

Change-Id: Ie8e3ad7cbaab3e5799e04bd50f2639390b0a2428

webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx