Warning: extra semicolons

[springmeyer]

In file included from deps/mapbox/variant/variant.hpp:14:
deps/mapbox/variant/recursive_wrapper.hpp:45:22: warning: extra ';' after member function definition [-Wextra-semi]
        : p_(new T){};
                     ^
deps/mapbox/variant/recursive_wrapper.hpp:47:49: warning: extra ';' after member function definition [-Wextra-semi]
    ~recursive_wrapper() noexcept { delete p_; };
                                                ^

/cc @artemp

[artemp]

@springmeyer - 👀 👍