gl-renderer: check EGL_EXT_platform_base in supports()
gl-renderer: check EGL_EXT_platform_base in supports()

An EGL implementation may support client extensions without supporting
EGL_EXT_platform_base. In such a case, we should return 0 to fall back
to the old eglGetDisplay() way.

Cc: Manuel Bachmann <d58f3f53462d5b02b85dbad407eeedd70c66c30c@open.eurogiciel.org>
Signed-off-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>
Reviewed-by: Daniel Stone <62e7e355d5d8400fa8384448796af0bf6be4ffae@collabora.com>

xorgy/weston,kwm81/weston,Fantu/compositor-spice,Gnurou/weston,Fantu/compositor-spice,jonnylamb/weston,eyolfson/weston,giucam/weston,xorgy/weston,Fantu/compositor-spice,mchalupa/weston,kwm81/weston,sir-murray/weston,Gnurou/weston,eyolfson/weston,Tarnyko/weston-xdg_surface_present,udoprog/weston,mchalupa/weston,Tarnyko/weston-xdg_surface_present,sir-murray/weston,giucam/weston,udoprog/weston,jonnylamb/weston,krezovic/weston,krezovic/weston