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Don't fail environmental check if README.md exists (but .txt and no-suffix don't)

/*
 (c) 2014 Glen Joseph Fernandes
 glenjofe at gmail dot com

 Distributed under the Boost Software
 License, Version 1.0.
 http://boost.org/LICENSE_1_0.txt
*/
#ifndef BOOST_ALIGN_DETAIL_ALIGNED_ALLOC_MACOS_HPP
#define BOOST_ALIGN_DETAIL_ALIGNED_ALLOC_MACOS_HPP

#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/align/detail/is_alignment.hpp>
#include <cstddef>
#include <stdlib.h>

namespace boost {
    namespace alignment {
        inline void* aligned_alloc(std::size_t alignment,
            std::size_t size) BOOST_NOEXCEPT
        {
            BOOST_ASSERT(detail::is_alignment(alignment));
            if (!size) {
                return 0;
            }
            if (alignment < sizeof(void*)) {
                alignment = sizeof(void*);
            }
            void* p;
            if (::posix_memalign(&p, alignment, size) != 0) {
                p = 0;
            }
            return p;
        }

        inline void aligned_free(void* ptr)
            BOOST_NOEXCEPT
        {
            ::free(ptr);
        }
    }
}

#endif