Avoid Wzero-as-null-pointer-constant warning (#75)

Newer compilers may warn when using `0`, e.g.:
```
./boost/iterator/detail/facade_iterator_category.hpp:161:5: error: zero as null pointer constant [-Werror,-Wzero-as-null-pointer-constant]
    BOOST_MPL_ASSERT_NOT((is_iterator_category<Traversal>));
    ^
./boost/mpl/assert.hpp:324:58: note: expanded from macro 'BOOST_MPL_ASSERT_NOT'
              boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
```

CMakeLists.txt

@@ -2,8 +2,6 @@
 # Distributed under the Boost Software License, Version 1.0.
 # See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
 
-if(NOT DEFINED IDF_TARGET)
-
 cmake_minimum_required( VERSION 3.5...3.20 )
 project( boost_mpl VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX )
 
@@ -22,24 +20,3 @@ target_link_libraries( boost_mpl
         Boost::type_traits
         Boost::utility
 )
-
-else()
-
-FILE(GLOB_RECURSE headers include/*.h include/*.hpp)
-
-idf_component_register(
-    SRCS
-        ${headers}
-    INCLUDE_DIRS
-        include
-    REQUIRES
-        boost_config
-        boost_core
-        boost_predef
-        boost_preprocessor
-        boost_static_assert
-        boost_type_traits
-        boost_utility
-)
-
-endif()

include/boost/mpl/assert.hpp

@@ -297,7 +297,7 @@ BOOST_MPL_AUX_ASSERT_CONSTANT( \
       std::size_t \
     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
           boost::mpl::assertion_failed<false>( \
-              boost::mpl::assert_arg( (void (*) pred)0, 1 ) \
+              boost::mpl::assert_arg( (void (*) pred)BOOST_NULLPTR, 1 ) \
             ) \
         ) \
     ) \
@@ -310,7 +310,7 @@ BOOST_MPL_AUX_ASSERT_CONSTANT( \
 enum { \
       BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
           boost::mpl::assertion<false>::failed( \
-              boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
+              boost::mpl::assert_not_arg( (void (*) pred)BOOST_NULLPTR, 1 ) \
             ) \
         ) \
 }\
@@ -321,7 +321,7 @@ BOOST_MPL_AUX_ASSERT_CONSTANT( \
       std::size_t \
     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
           boost::mpl::assertion_failed<false>( \
-              boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
+              boost::mpl::assert_not_arg( (void (*) pred)BOOST_NULLPTR, 1 ) \
             ) \
         ) \
    ) \