[Mesa-dev] st/xorg targets/xorg cleanups v2

[Emil Velikov]

Slight extension over the previous two patches, removing unused variables
and headers. Last two patches do not strictly below in this series, as
they provide more consistent automake/configure usage of pkg-config
(PKG_CHECK_MODULES).

Please comment and review.

Cheers,
Emil

[PATCH 1/7] st/xorg: remove unnecessary headers
[PATCH 2/7] st/xorg: add sanity checks after malloc
[PATCH 3/7] st/xorg: drop set but unsused variables dxo, dyo
[PATCH 4/7] gallium/targets/xorg: drop set but unused variable entity
[PATCH 5/7] targets/xorg-nouveau: drop usage of dri1 function
[PATCH 6/7] configure: use PKG_CONFIG variable over hardcoded
[PATCH 7/7] automake: properly handle non-default expat installation