Revert "set up GL sample app to build through Bazel Mac toolchain"

This reverts commit 9be648ad648467650ca6261cfd36c25e6a5219a5.

Reason for revert: breaking G3 roll

Original change's description:
> set up GL sample app to build through Bazel Mac toolchain
>
> Suggested review order.
> 1) tools/sk_app/* and src/gpu/ganesh/*
> sets up the actual target to be built by the toolchain
> 2) toolchain/* and .bazelrc
> changes to the mac hermetic toolchain, including support for framework dependencies, objc compilation, and dynamic lib dependency resolution
>
> Change-Id: Ic8209b97a0d8448f984d43a579e600ba4e9118e1
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/549897
> Commit-Queue: Jorge Betancourt <jmbetancourt@google.com>
> Reviewed-by: Ben Wagner <bungeman@google.com>

Change-Id: I5414b94f2c6175ea8c7dbc6cd72c7dd8d1b47892
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/551236
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
7 files changed