This updates the PKGBUILD to build tags instead of the release branch
(which will see commits until the specific release is EOL),
This commit also adds building the mesa-xatracker package.
[ci:skip-build]: already built successfully in CI
This adds a Mesa package overriding Mesa in Alpine, and:
1) builds a much newer version of Mesa than what is found in Alpine (by
*not* building amd/radeonsi support, so no dependency on llvm).
2) builds Mesa with tegra and etnaviv drivers (note, as of now, the
librem5 devkit gpu is not supported in the etnaviv driver here)
This breaks "pmbootstrap qemu" for some people, use --host-qemu as
workaround for now (a fix will be available soon):
https://wiki.postmarketos.org/wiki/Troubleshooting:QEMU#Using_QEMU_from_the_host_system
Since this also fixes the blackscreen bug on lg-hammerhead, the
trade-off with the qemu bug is worth it.
[ci:skip-build]: already built successfully in CI
