Move the GL_APICALL and similar defines to the project level. BUG=angle:658 Change-Id: Ib4fa10bb89a6658efbc20d5a763d8ec9c3a5506f Reviewed-on: https://chromium-review.googlesource.com/201465 Tested-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>