Revert "Build introspection again"
Revert "Build introspection again"

This reverts commit 853f3ddd12ea2fbf3bed551ebfd542536e7f42e0.
The introspection stuff doesn't hook into the build system correctly
and hence breaks "distcheck".  Need to look into it again.

kari-lentz/alpha-pango,zsx/pango,danny-ku/pango,danny-ku/pango,Distrotech/pango,zsx/pango,kari-lentz/alpha-pango,Distrotech/pango,OpenInkpot-archive/iplinux-pango1.0,zsx/pango,kari-lentz/alpha-pango,OpenInkpot-archive/iplinux-pango1.0,Distrotech/pango,danny-ku/pango,kari-lentz/alpha-pango,zsx/pango,OpenInkpot-archive/iplinux-pango1.0