[arch-dev-public] dropping gcin

[Andreas Radke]

we're having gcin (Chinese input method) orphaned for a very long time
and i guess no developer is interested in maintaining it or even able
to set it up well. we have one or more outstanding bugs for a long time
i cannot confirm or fix.

i think we should leave the maintenance up to the community. they
will do it far better. if no TU wants to take it i'd like to move it
to unsupported.

objections?

-Andy