zeroing callbacks upon window creation continues to work correctly git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1471 7f0cb862-5218-0410-a997-914c9d46530a
zeroing callbacks upon window creation continues to work correctly git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1471 7f0cb862-5218-0410-a997-914c9d46530a