Redefine: isGLES3Compatible() and isGL4ES3(), i.e. allow GL4ES3 usage in case proper ES3_compat is given.

isGLES3Compatible() and isGL4ES3() of GLBase _and_ GLContext
includes [ GL >= 4.3, GL >= 3.1 w/ GL_ARB_ES3_compatibility and GLES3 ].

Tested GL 'aliasing' w/ TestGLProfile01NEWT, i.e. isGL*() and getGL*().