Removed old PKGBUILDs

Most of these were modifications to the ones in the AUR to make them
build at the time, which now have been fixed. Some of them I started
writing and never finished since I determined they wouldn't be very
useful for me. Some of them I wrote that eventually somebody else wrote
and put in the AUR (maybe there should be a place to index/search
partially-working PKGBUILDs so people don't have to write them all from
scratch if somebody else has already attempted?). Just some cleanup.