EGL_MESA_screen_surface version 7

[Jon Smirl]

eglGetScreensMESA() removes the need for this:

    EGLBoolean eglQueryDisplayMESA(EGLDisplay dpy, EGLScreenMESA screen,
                                  EGLint attrib, EGLint *value)

   Used to query display parameters.  <attrib> may be one of the following:

       Name                   Return value description
       ---------------------  ---------------------------------------------
       EGL_SCREEN_COUNT_MESA  Current number of screens available.


-- 
Jon Smirl
jonsmirl at gmail.com