Some CI fixes/updates

Add fedora-33-amd64 as a build target

Use the meson macros in talkatu.spec.in rather than running it manually.

Testing Done:
Successfully ran the build for `fedora-31-amd64` and `fedora-32-amd64` but `fedora-33-amd64` and `fedora-rawhide-amd64` are failing with the `c compiler can't build executables` error I'm still working on figuring out.

Reviewed at https://reviews.imfreedom.org/r/123/