mesa can build certain things without opengl: most importantly vulkan
drivers.
Add comments on the dependencies between the packageconfigs. Also add
a few dependencies to packageconfigs. Modify default packageconfig to
do the reasonable thing based on distro features.
Add a backported patch to fix the build with --disable-opengl. Fix
do_install_append() so it works even if dri drivers are not built.
Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
