Makefile build system should have pyrogenesis/test targets depend on Collada

[Philip Taylor]

The Collada target is a run-time dependency for pyrogenesis and test, so it ought to get built automatically when people run make pyrogenesis and make test. Currently it doesn't.

It's not a build-time dependency for the executables, and shouldn't be used when linking, so Premake's package.links does not seem to be a suitable place to put it. Is there another way? or maybe Premake needs to be patched to support non-linking dependencies?