Remove the flag -static-libgcc and -static-libstdc++
Add property linkflags to cc_config for using in blade.conf
Remove dependency to protobuf in thirdparty
Adapt to Clang warning parameters: change -Wno-unused-buf-set-variables into -Wno-unused-variables, and remove -Wno-unused-local-typedefs
Remove -mcx16 flag which is only supported by GCC
Substitue -W,--whole-archive by -all_load
Use system-wide protobuf