Failures on windows:
unknown file: error: SEH exception with code 0xc0000005 thrown in the
test body.

Alignment check errors on linux:
test_libvpx: ../libvpx/vpx_dsp/variance.c:230: void
vpx_comp_avg_pred_c(uint8_t *, const uint8_t *, int, int, const uint8_t
*, int): Assertion `((intptr_t)comp_pred & 0xf) == 0' failed.

BUG=webm:1390

Change-Id: I5eed5381c0f1a8fe594a128eb415e77232f544ea