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

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

Change-Id: Ib873c29a3321b9c994482a339f5237ee36c4c67d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>