BUG: Missing linker flag for -lGL

git-svn-id: http://gpuocelot.googlecode.com/svn/trunk@2219 ec522b64-56cd-11de-8d7d-01d876f1962d
BUG: Don't explicitly specify boost libraries in SConscript.

git-svn-id: http://gpuocelot.googlecode.com/svn/trunk@2220 ec522b64-56cd-11de-8d7d-01d876f1962d