Set the min and max allowed glib versions

We currently get a warnings when compiling against glib >= 2.70.0 because some of the GType macros are using symbols that were added in 2.70.0.

Testing Done:
Compiled, need to test debian and fedora packages after 962 is merged.

Bugs closed: GPLUGIN-140

Reviewed at https://reviews.imfreedom.org/r/963/