EGL: Loader: Enable desktop openGL on Nvidia platforms

There is some specific code I reversed from the EGL library that sets
the openGL bit in a data struct when getProcAddr is called with
eglSentinelNvFrameworks.

Change-Id: I9c1eaba65c65dfc9b3e500ad627a492ec6ce2f36
Signed-off-by: Simão Gomes Viana <devel@superboring.dev>