test for c++17 w/ c++14 stdlib

Apparently some of our stdlibs are not even quite c++11 compliant.

Bug: skia:9700
Change-Id: I842c2dd2eba55d576aa60b2b3a4734dbace00f6b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259074
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
6 files changed