inputmethod/unicom-im: bad patch, bad mastersite

The mastersite resolves to a parking domain, causing the html page to be
interpreted as a tarball download which doesn't pass the checksum of course.
Luckily this tarball is backed up at NetBSD, so remove the mastersite so it
can fall back to NetBSD.

Secondly, a patch from 2007 was mispelled and was never included into the
distinfo.  Obviously it built anyway, but the patch was renamed and the
distinfo file regenerated.

(marino)