Description of problem:

I'm testing out builds with protobuf 3.3.1 here:
https://copr.fedorainfracloud.org/coprs/orion/protobuf3/

usbguard fails to compile due to -Werror:

/bin/sh ./libtool  --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H -I. -I./src  -fPIC -I./src -I./src/Library -I./src/Library/IPC    -std=c++11 -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic  -fvisibility=hidden  -Werror  -pedantic -Wno-unknown-pragmas -Wall -Wextra -Wformat=2 -Wredundant-decls -Wmissing-declarations -Wmissing-include-dirs -Wmissing-format-attribute -Wswitch-enum -Wswitch-default -Winvalid-pch -Wformat-nonliteral -Wno-missing-field-initializers -Wno-implicit-fallthrough  -Wno-missing-declarations -c -o src/Library/IPC/libusbguard_la-Message.pb.lo `test -f 'src/Library/IPC/Message.pb.cc' || echo './'`src/Library/IPC/Message.pb.cc
libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I./src -fPIC -I./src -I./src/Library -I./src/Library/IPC -std=c++11 -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic -fvisibility=hidden -Werror -pedantic -Wno-unknown-pragmas -Wall -Wextra -Wformat=2 -Wredundant-decls -Wmissing-declarations -Wmissing-include-dirs -Wmissing-format-attribute -Wswitch-enum -Wswitch-default -Winvalid-pch -Wformat-nonliteral -Wno-missing-field-initializers -Wno-implicit-fallthrough -Wno-missing-declarations -c src/Library/IPC/Message.pb.cc  -fPIC -DPIC -o src/Library/IPC/.libs/libusbguard_la-Message.pb.o
src/Library/IPC/Message.pb.cc: In member function 'virtual google::protobuf::uint8* usbguard::IPC::MessageHeader::InternalSerializeWithCachedSizesToArray(bool, google::protobuf::uint8*) const':
src/Library/IPC/Message.pb.cc:266:10: error: unused parameter 'deterministic' [-Werror=unused-parameter]
     bool deterministic, ::google::protobuf::uint8* target) const {
          ^~~~~~~~~~~~~
cc1plus: all warnings being treated as errors

Version-Release number of selected component (if applicable):
0.7.0-3