build: Remove gir files from dist
build: Remove gir files from dist

The introspection data is going to be generated, so it should never be
in the dist.

gcampax/cogl,djdeath/cogl,djdeath/cogl-android,Distrotech/cogl,Distrotech/cogl,collects/cogl,djdeath/cogl,djdeath/cogl-android,collects/cogl,gcampax/cogl,spatulasnout/cogl,Distrotech/cogl,djdeath/cogl,gcampax/cogl,Distrotech/cogl,djdeath/cogl-android,gcampax/cogl,spatulasnout/cogl