Merge "libtextclassifier: pin cpp_std to gnu++17" into main am: 0ab5782399 am: 6df69a22be

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

Change-Id: Id5c0c30b5f0adbea419df31714b77143263a194b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>