added the init error handler example program contributed by Chris Marshall

Not building it as part of the demos yet, since it was submitted quite late in the 3.0 release process

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1750 7f0cb862-5218-0410-a997-914c9d46530a