lp:mir FTBFS: error: looser throw specifier for ‘virtual mir::frontend::detail::ProtobufMessageProcessor::~ProtobufMessageProcessor()’

It's the gcc-4.7 bug again...

In file included from /home/dan/bzr/mir/bypass/src/server/frontend/protobuf_message_processor.cpp:20:0:
/home/dan/bzr/mir/bypass/src/server/frontend/protobuf_message_processor.h:46:8: error: looser throw specifier for ‘virtual mir::frontend::detail::ProtobufMessageProcessor::~ProtobufMessageProcessor()’
In file included from /home/dan/bzr/mir/bypass/src/server/frontend/protobuf_message_processor.h:23:0,
                 from /home/dan/bzr/mir/bypass/src/server/frontend/protobuf_message_processor.cpp:20:
/home/dan/bzr/mir/bypass/src/server/frontend/message_processor.h:50:13: error: overriding ‘virtual mir::frontend::detail::MessageProcessor::~MessageProcessor() noexcept (true)’
make[2]: *** [src/server/frontend/CMakeFiles/mirfrontend.dir/protobuf_message_processor.cpp.o] Error 1
make[1]: *** [src/server/frontend/CMakeFiles/mirfrontend.dir/all] Error 2
make: *** [all] Error 2