Add old style find boost applying option to cmake.

When cmake has -D MSGPACK_BOOST_USE_OLD_CMAKE=ON option, cmake use old style find boost.

CMakeLists.txt

@@ -67,7 +67,9 @@ ENDIF ()
 IF (MSGPACK_USE_BOOST)
     IF ((CMAKE_VERSION VERSION_GREATER 3.30) OR
         (CMAKE_VERSION VERSION_EQUAL 3.30))
-        CMAKE_POLICY(SET CMP0167 NEW)
+        IF (NOT MSGPACK_BOOST_USE_OLD_CMAKE)
+            CMAKE_POLICY(SET CMP0167 NEW)
+        ENDIF ()
     ENDIF ()
     SET (Boost_USE_MULTITHREADED ON)
 

appveyor.yml

@@ -41,6 +41,7 @@ build_script:
           $env:cpp11 `
           -D MSGPACK_BUILD_EXAMPLES=ON `
           -D MSGPACK_BUILD_TESTS=ON `
+          -D MSGPACK_BOOST_USE_OLD_CMAKE=ON `
           -D CMAKE_EXE_LINKER_FLAGS=/LIBPATH:"$env:boost_prefix\$env:boost_subdir" `
           -D CMAKE_PREFIX_PATH="$env:boost_prefix;$env:APPVEYOR_BUILD_FOLDER\zlib-1.3.1\prefix" `
           -D CMAKE_INSTALL_PREFIX="$env:APPVEYOR_BUILD_FOLDER\prefix" `

test-install/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.5...4.0)
 
 project(test-install LANGUAGES CXX)