Remove accessibility.conf from EXTRA_DIST
Remove accessibility.conf from EXTRA_DIST

Accessibility.conf is generated now; it is bad to include it in the
release.

https://bugzilla.gnome.org/show_bug.cgi?id=742987

GNOME/at-spi2-core,GNOME/at-spi2-core,GNOME/at-spi2-core