Android: Pin skia's cpp_std to gnu++17

This project doesn't build with gnu++20 and prevents AOSP default to be
upgraded to a newer standard. Once the build failure is fixed here, this
change can be reverted.

Ported from https://android-review.git.corp.google.com/c/platform/external/skia/+/2831974

Added a pin in skia_nanobench.

Bug: 311052584
Change-Id: Iad676f72dfa16665d515523a7146d22eded7eb60
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/779876
Commit-Queue: Nolan Scobie <nscobie@google.com>
Auto-Submit: Leon Scroggins <scroggo@google.com>
Reviewed-by: Nolan Scobie <nscobie@google.com>
1 file changed