egl: resolve build issue with pre EGL 1.5 headers
In some cases (like building on Android) the headers might not have the
1.5 definitions, leading to a build failures like the one in github
issue #41.
Since the ABI is baked in stone, add a local define to resolve that.
Fixes:
f8a485e7cc7 ("egl: Improve support for robust GLES contexts on EGL 1.5")
Issue: https://github.com/waffle-gl/waffle/issues/41
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Chad Versace <chadversary@chromium.org>