Support compiling without GetProcAddress Move GetProcAddress implementation next to the proc array. This way it is possible to not compile the implementation. Bug: angleproject:393513311 Change-Id: Ic9c9022ee74a7619bec25f1481fd9da68b14b119 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6219320 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Auto-Submit: Kimmo Kinnunen <kkinnunen@apple.com> Commit-Queue: Kimmo Kinnunen <kkinnunen@apple.com>