Merge "libtextclassifier: pin cpp_std to gnu++17" into main am: 0ab5782399 am: 4002d43964 am: 3882ca9d63

Original change: https://android-review.googlesource.com/c/platform/external/libtextclassifier/+/2833010

Change-Id: I0718b8d12889e5b569046f58a8f4daa635a7b1fa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>