Swtich to common Boost configuration for CMake with boost_gil target

[mloskot]

We should switch to the common configuration developed by @pdimov for Boost.
It is simplest possible, working CMake for Boost based on generating bolierplate, with minimal maintenance required, which works very well, which still allows customised configuration.

• boostdep --cmake gil
• https:/boostorg/cmake/
• CMakeListst.txt for boostorg/mp11
• CMakeListst.txt for boostorg/histogram

References

• Should address and close Define CMake target Boost::gil in CMakeLists.txt #167
• Should also address Move operations only relevant for test out of main CMakeLists.txt #168
• Add a Boost-friendly subproject case to CMakeLists #614

Example

# Generated by `boostdep --cmake gil`
# Copyright 2020 Peter Dimov
# Distributed under the Boost Software License, Version 1.0.
# https://www.boost.org/LICENSE_1_0.txt
cmake_minimum_required(VERSION 3.5...3.16)
project(boost_gil VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
add_library(boost_gil INTERFACE)
add_library(Boost::gil ALIAS boost_gil)
target_include_directories(boost_gil INTERFACE include)
target_link_libraries(boost_gil
  INTERFACE
    Boost::assert
    Boost::concept_check
    Boost::config
    Boost::core
    Boost::filesystem
    Boost::integer
    Boost::iterator
    Boost::mp11
    Boost::mpl
    Boost::numeric_conversion
    Boost::preprocessor
    Boost::variant
)
if(BUILD_TESTING AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt")
  add_subdirectory(test)
endif()

[mloskot]

Done in

• Add a Boost-friendly subproject case to CMakeLists #614