Log Message:
fonts/fontconfig: Bump bl3 API_dEPENDS to 2.11.91

If the base freetype is old, and some but not all freetype-using
packages need newer, we end up with some binaries having two different
freetypes.  Adjust freetype's API_DEPENDS to 2.8.1, because
pango needs at least that.  This means that pkgsrc freetype will
always be used on netbsd-8.

(ABI_DEPENDS should perhaps be bumped as well, and it's hard to
believe that there has been no ABI change since 2.4.11.)

(Needs a revbump.)

As discussed on tech-pkg.