Provide no-op ChromiumBrowser::onResize() for __APPLE__.

This resolves a link dependency.
Try to build in 32-bit mode on Mac.
Invoke CMake find_package(OpenGL), (GLUT) on APPLE as well as UNIX.
On __APPLE__, need to #include just "glut.h" instead of <GL/glut.h>.
Merge pull request #4 from nat-goodspeed/master

Update mac branch to state that builds on Nat's Mac