dri: extend fence extension to support native fd fences
dri: extend fence extension to support native fd fences

Required to implement EGL_ANDROID_native_fence_sync.

Signed-off-by: Rob Clark <6f78cdb10adbe0a7fbbf4098125a51f401c77a5f@freedesktop.org>
Tested-by: Rafael Antognolli <23baadb5a81be7cd65c37490e682e3faa5f22835@intel.com>
Reviewed-by: Chad Versace <4b94d436ff8c93527a96d251ac64b06311506efe@chromium.org>
Tested-by: Chad Versace <4b94d436ff8c93527a96d251ac64b06311506efe@chromium.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler