Disable a warning for newer gcc in protobuf
Disable a warning for newer gcc in protobuf

This is not an issue in the CI as we're running an older
compiler there, but running build-and-test.sh locally on
a current machine can easily trigger that.

Once we have a newer protobuf (attempt #1436 failed
due to non-compatible changes), this should not be
necessary anymore.

Signed-off-by: Henner Zeller <259ad50fabbfd39355f36ecd6c0afca541ea66ef@acm.org>

chipsalliance/verible,chipsalliance/verible,chipsalliance/verible,chipsalliance/verible,chipsalliance/verible