grim/libgnt

Make doc/introspection options yield to parent.

2020-08-22, Elliott Sales de Andrade
d67ecd2b2223
Make doc/introspection options yield to parent.

This allows `meson -Ddoc=false` to automatically propagate from Pidgin to the libgnt subproject, without having to specify `-Dlibgnt:doc=false`.

Reviewed at https://reviews.imfreedom.org/r/85/
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')