Avoid warnings in bison generated files
Last macOS clang raises a warning about the yynerrs_ variable which is set but never used. This ticket disables the -Wunused-but-set-variable warning in these files so Kea can be built with --with-werror.
Last macOS clang raises a warning about the yynerrs_ variable which is set but never used. This ticket disables the -Wunused-but-set-variable warning in these files so Kea can be built with --with-werror.