gn2bp: Remove -Wno-deprecated-non-prototype from C++ defaults am: e58e4d59af

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2402003

Change-Id: Idf7fb768ef09f1cd37854ee11d51d731c77d8659
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>