x11-toolkits/libadwaita: track more dependencies

> Running Q/A tests (stage-qa)

Error: /usr/local/lib/libadwaita-1.so.0 is linked to /usr/local/lib/libfribidi.so.0 from converters/fribidi but it is not declared as a dependency
Warning: you need LIB_DEPENDS+=libfribidi.so:converters/fribidi
Error: /usr/local/lib/libadwaita-1.so.0 is linked to /usr/local/lib/libgraphene-1.0.so.0 from graphics/graphene but it is not declared as a dependency
Warning: you need LIB_DEPENDS+=libgraphene-1.0.so:graphics/graphene