build: Add automake conditionals for gallium drivers
radeon/llvm: Convert to Automake

v2: Johannes Obermayr <johannesobermayr@gmx.de>
    Fix some undefined symbols.

v3: Johannes Obermayr <johannesobermayr@gmx.de>
    Build it -shared to fix egl_gallium.so on r600/radeonsi builds.
build: Don't build pipebuffer

It's already built by src/gallium/auxiliary.
Remove state_tracker/Makefile

Unneeded and unnecessary.
state_trackers: Convert to automake
state_trackers/egl: Convert to automake
state_trackers/gbm: Convert to automake
state_trackers/glx: Convert to automake
Remove vdpau hack
state_trackers/vdpau: Convert to automake
state_trackers/vega: Convert to automake
state_trackers/xa: Convert to automake
state_trackers/xorg: Convert to automake
Remove xvmc hack
state_trackers/xvmc: Convert to automake
state_trackers/xvmc/test: Convert to automake
build: Update drivers/Makefile.am to use LTLIBRARIES
targets/dri-i915: Convert to automake

v2: Andreas Boll <andreas.boll.dev@gmail.com>
    - Provide compatibility with scripts for the old Mesa build system
targets/dri-nouveau: Convert to automake

v2: Andreas Boll <andreas.boll.dev@gmail.com>
    - Provide compatibility with scripts for the old Mesa build system
targets/dri-r300: Convert to automake

v2: Andreas Boll <andreas.boll.dev@gmail.com>
    - Provide compatibility with scripts for the old Mesa build system