libharu-2.2.1.tar.gz disappears

Overnight, my project's build suddenly failed. The makefile is supposed to download and rebuild the libharu pdf generation library whenever it creates a clean build. It turned out that the libharu project has moved all its files on to Github and this much-used stable release has not been tagged.

Luckily I found a mirror under the Fedora project's repository - thanks Fedora!