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egl: Fix _eglPointerIsDereferencable on systems w/o mincore()

Alexander van der Grinten requested to merge avdgrinten/mesa:fix-egl-dereferencable into master

On platforms without mincore(), _eglPointerIsDereferencable(void *p) currently just checks whether p != NULL. This is not sufficient: In the Wayland platform code (i.e., in get_wl_surface_proxy()), _eglPointerIsDereferencable() is called on the version field of struct wl_egl_window which is 3 on current versions of Wayland. This causes a segfault when trying to dereference p.

Fix this behavior by assuming that the first page of the process is never dereferencable.

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