Remove unneeded stuff

src/text/boost/config.hpp

-#ifndef BOOST_CXX14_CONSTEXPR
-# define BOOST_CXX14_CONSTEXPR
-#endif

src/text/boost/text/config.hpp

 #ifndef BOOST_TEXT_CONFIG_HPP
 #define BOOST_TEXT_CONFIG_HPP
 
-#include <boost/config.hpp>
-
 
 /** There are ICU-based implementations of many operations, but those are only
     defined when BOOST_TEXT_HAS_ICU is nonzero.  If you define this, you must
@@ -38,7 +36,7 @@
 #    define BOOST_TEXT_CXX14_CONSTEXPR
 #    define BOOST_TEXT_NO_CXX14_CONSTEXPR
 #else
-#    define BOOST_TEXT_CXX14_CONSTEXPR BOOST_CXX14_CONSTEXPR
+#    define BOOST_TEXT_CXX14_CONSTEXPR
 #    if defined(BOOST_NO_CXX14_CONSTEXPR)
 #        define BOOST_TEXT_NO_CXX14_CONSTEXPR
 #    endif

src/text/boost/text/detail/sentinel_tag.hpp

-#ifndef BOOST_TEXT_DETAIL_SENTINEL_TAG_HPP
-#define BOOST_TEXT_DETAIL_SENTINEL_TAG_HPP
-
-
-namespace boost { namespace text { namespace detail {
-    struct sentinel_tag
-    {};
-    struct non_sentinel_tag
-    {};
-}}}
-
-#endif

src/text/boost/text/grapheme_break.hpp

 #ifndef BOOST_TEXT_GRAPHEME_BREAK_HPP
 #define BOOST_TEXT_GRAPHEME_BREAK_HPP
 
-#include <boost/text/config.hpp>
-
 #include <array>
 #include <unordered_map>
 
 #include <stdint.h>
 
+#define BOOST_TEXT_DECL
 
 namespace boost { namespace text {
 

src/text/grapheme_break.cpp

@@ -2,8 +2,6 @@
 #include <boost/text/grapheme_break.hpp>
 #include <boost/text/detail/break_prop_iter.hpp>
 
-#include <boost/assert.hpp>
-
 #include <algorithm>
 #include <array>
 #include <unordered_map>
@@ -3583,8 +3581,8 @@ std::copy(
     compressed.begin(),
     compressed.end(),
     lzw_to_break_prop_iter<grapheme_property>(retval, buf));
-BOOST_ASSERT(buf.empty());
-BOOST_ASSERT(retval.size() == 15958);
+assert(buf.empty());
+assert(retval.size() == 15958);
 return retval;
 }