glew: Stop polluting /tmp during builds

Currently the glew code creates a new directory in /tmp for each make
invocation. This is a bit ugly, don't do that. The patch does break the
dist targets but we don't use them.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 3a55194f)
Signed-off-by: Steve Sakoman <steve@sakoman.com>