Apply workaround for Intel-16

Without this I see:
```
/boost/core/noncopyable.hpp(42): error: defaulted default constructor cannot be constexpr because the corresponding implicitly declared default constructor would not be constexpr
        BOOST_CONSTEXPR noncopyable() = default;
```
See: https://travis-ci.org/boostorg/type_traits/jobs/4722892817
Not sure if later Intel versions also require this... still working on that.

.travis.yml

@@ -253,18 +253,8 @@ matrix:
       compiler: clang++
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
 
-    - os: linux
-      compiler: g++
-      env: CMAKE_SUBDIR_TEST=1
-      script:
-      - cd libs/core/test/cmake_subdir_test && mkdir __build__ && cd __build__
-      - cmake ..
-      - cmake --build .
-      - cmake --build . --target check
-
 install:
-  - BOOST_BRANCH=develop
-  - if [ "$TRAVIS_BRANCH" = "master" ]; then BOOST_BRANCH=master; fi
+  - BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true
   - cd ..
   - git clone -b $BOOST_BRANCH https://github.com/boostorg/boost.git boost-root
   - cd boost-root
@@ -284,8 +274,7 @@ install:
 script:
   - |-
     echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
-  - BUILD_JOBS=`(nproc || sysctl -n hw.ncpu) 2> /dev/null`
-  - ./b2 -j $BUILD_JOBS libs/core/test toolset=$TOOLSET cxxstd=$CXXSTD variant=debug,release ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined define=UBSAN=1 debug-symbols=on} ${LINKFLAGS:+linkflags=$LINKFLAGS}
+  - ./b2 -j 3 libs/core/test toolset=$TOOLSET cxxstd=$CXXSTD variant=debug,release ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined define=UBSAN=1 debug-symbols=on} ${LINKFLAGS:+linkflags=$LINKFLAGS}
 
 notifications:
   email:

appveyor.yml

@@ -73,4 +73,4 @@ build: off
 test_script:
   - PATH=%ADDPATH%%PATH%
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
-  - b2 -j %NUMBER_OF_PROCESSORS% libs/core/test toolset=%TOOLSET% %CXXSTD%
+  - b2 -j 3 libs/core/test toolset=%TOOLSET% %CXXSTD%

include/boost/core/noncopyable.hpp

@@ -38,7 +38,8 @@ namespace noncopyable_  // protection from unintended ADL
   class noncopyable: base_token
   {
   protected:
-#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && !defined(BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS)
+#if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && !defined(BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS)\
+      && !BOOST_WORKAROUND(__ICC, <= 1600)
       BOOST_CONSTEXPR noncopyable() = default;
       ~noncopyable() = default;
 #else

test/cmake_subdir_test/CMakeLists.txt

@@ -1,19 +0,0 @@
-# Copyright 2018, 2019 Peter Dimov
-# 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
-
-cmake_minimum_required(VERSION 3.5)
-
-project(cmake_subdir_test LANGUAGES CXX)
-
-add_subdirectory(../.. boostorg/core)
-add_subdirectory(../../../assert boostorg/assert)
-add_subdirectory(../../../config boostorg/config)
-
-add_executable(quick ../quick.cpp)
-target_link_libraries(quick Boost::core)
-
-enable_testing()
-add_test(quick quick)
-
-add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)