gplugin/gplugin

Bump the minimum meson to 0.61.0 and clean up some warnings

2022-04-18, Gary Kramlich
55291fd09e7d
Bump the minimum meson to 0.61.0 and clean up some warnings

Testing Done:
Compiled.

Reviewed at https://reviews.imfreedom.org/r/1350/
if get_option('rs')
add_languages('rust')
subdir('tests')
endif # rs