main/mesa: consolidate subpackages

Mesa uses so-called "megadrivers" to link multiple drivers into
one shared library. Essentially there are only 4 distinct shared
libraries built:

   - libmesa_dri_drivers.so ("classic" DRI drivers)
   - libgallium_dri.so (Gallium DRI drivers)
   - libgallium_drv_video.so (Gallium VAAPI drivers)
   - libvdpau_gallium.so.1.0.0 (Gallium VDPAU drivers)
   - (Note: Vulkan drivers are all built separately)

These shared libraries are then hard-linked for each driver
(i965, radeon, freedreno, ...).

The APKBUILD attempts to create minimal packages by splitting
the drivers into separate subpackages.
Unfortunately this has exactly the opposite effect in this case.

Instead of preserving the hard links with one large Mesa package,
we copy the same shared library over and over again into separate
subpackages. This causes significant overhead for storing all the
apk packages, but also when installing multiple drivers on one system.

The only useful separation we can make are the megadrivers themselves,
i.e. one subpackage for each of the shared libraries mentioned above.

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