removing obsolete file

include/boost/histogram/detail/data.hpp

@@ -1,48 +0,0 @@
-// Copyright 2019 Hans Dembinski
-//
-// Distributed under the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt
-// or copy at http://www.boost.org/LICENSE_1_0.txt)
-
-#ifndef BOOST_HISTOGRAM_DETAIL_DATA_HPP
-#define BOOST_HISTOGRAM_DETAIL_DATA_HPP
-
-#include <initializer_list>
-
-namespace boost {
-namespace histogram {
-namespace detail {
-
-#if __cpp_lib_nonmember_container_access >= 201411
-
-using std::data;
-
-#else
-
-template <class C>
-constexpr auto data(C& c) -> decltype(c.data()) {
-  return c.data();
-}
-
-template <class C>
-constexpr auto data(const C& c) -> decltype(c.data()) {
-  return c.data();
-}
-
-template <class T, std::size_t N>
-constexpr T* data(T (&array)[N]) noexcept {
-  return array;
-}
-
-template <class E>
-constexpr const E* data(std::initializer_list<E> il) noexcept {
-  return il.begin();
-}
-
-#endif
-
-} // namespace detail
-} // namespace histogram
-} // namespace boost
-
-#endif // BOOST_HISTOGRAM_DETAIL_DATA_HPP