Merge "libtextclassifier: pin cpp_std to gnu++17" into main am: 0ab5782399 am: 6df69a22be am: 8fb498b385

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

Change-Id: I2491d5ea9729b47c99749da1ac4cac8d74db5f10
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>