Reduce the number of suppressed warnings
Reduce the number of suppressed warnings

Only -fno-warn-unused-binds -fno-warn-missing-signatures are still
needed, but they are mostly harmless. Alex generated code can still be
build with -Wall and -Werror.

alanz/Alex,Teino1978-Corp/Teino1978-Corp-alex,alanz/Alex,simonmar/alex,simonmar/alex,Teino1978-Corp/Teino1978-Corp-alex