hasl/hasl

Do some Meson cleanups done elsewhere

6 months ago, Elliott Sales de Andrade
ca6442534909
Do some Meson cleanups done elsewhere

- Remove unused variables
- Use `libraries` for `pkgconfig.generate`

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/2806/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "hasl/hasl"
REPOSITORY_TYPE = "mercurial"
BRANCH = "default"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False