Revert "Add a hack to <stdlib.h> until we can fix libvpx."

This reverts commit 3fb5097a7eec40404760c304b36c8b657b374cab.
libvpx is now fixed.

(cherry-pick of 2be1be47aa9b63568fe6ce1e0a4029b37d90764d.)

Bug: 15598056
Change-Id: Icca974e667f92206505f484bd291726eb0150f68
1 file changed