meson: split and simplify dependencies

Rather than group dependencies in complex groups, use a flatter
structure with split dependencies to avoid checking for the same
dependencies twice.

v2: - Fix building vulkan drivers without gallium or dri drivers
v3: - Drop TODO comment that is done
    - Fix typo in commit message

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
3 files changed