Since we are at it, replace "cd" with pushd / popd and homogenize how
VK-GL-CTS is built in comparison with other build scripts.
Signed-off-by: Andres Gomez <agomez@igalia.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>