[Win issues] Ignore osg-example compiler warning & adapt to new GLBINDING_BINARIES cmake-config

**OSG-3.3.1** headers included by **osg-example** produce a compiler warning (4100 - unused parameter references) in MSVC which prevents compilation. Ignoring the compiler warning when including the osg header files fixes this. Additionally a small change to the examples CMakeLists is necessary if https://github.com/hpicgs/glbinding/pull/47 is accepted
remove this, since it relates to another issue - then we can apply this PR