libgnt/libgnt

Add the gir target to the library dependency and some other meson cleanups

2021-09-25, Gary Kramlich
3388eea5b082
Add the gir target to the library dependency and some other meson cleanups

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/940/
option('doc', type : 'boolean', value : true, yield : true,
description : 'build documentation with gtk-doc')
option('introspection', type : 'boolean', value : true, yield : true,
description : 'build introspection data')