cmake: add support for most recent Boost version

Any decent CMake installation is not capable of finding Boost 1.57.0 as
it is not configured to do so. This fixes this issue.

Author: torbjoernk

3rdparty/CMakeLists.txt

@@ -7,6 +7,7 @@ message(STATUS "----------------------------------------------------------------
 message(STATUS "Boost")
 
 set(Boost_USE_MULTITHREADED ON)
+set(Boost_ADDITIONAL_VERSIONS "1.57" "1.57.0" ${Boost_ADDITIONAL_VERSIONS})
 
 if(${compiler_version_available} AND ${CMAKE_CXX_COMPILER_ID} MATCHES Clang)
     set(Boost_COMPILER "-clang${CMAKE_CXX_COMPILER_VERSION_MAJOR}${CMAKE_CXX_COMPILER_VERSION_MINOR}")