Fix doc build
Fix doc build

When gtk-doc regenerated the pango.types file, it includes
get_type functions for platform-specific things that will
cause link failures.

kari-lentz/alpha-pango,kari-lentz/alpha-pango,kari-lentz/alpha-pango,danny-ku/pango,Distrotech/pango,Distrotech/pango,kari-lentz/alpha-pango,danny-ku/pango,danny-ku/pango,Distrotech/pango