Upgrade boost to 1.69

SuperBuild/CMake/External_boost.cmake

@@ -79,8 +79,8 @@ set(BOOST_BUILD_COMMAND ${CMAKE_COMMAND}
 #NOTE: update _SB_Boost_INCLUDE_DIR below when you change version number
 ExternalProject_Add(BOOST
   PREFIX BOOST
-  URL "http://downloads.sourceforge.net/project/boost/boost/1.60.0/boost_1_60_0.tar.bz2"
-  URL_MD5 65a840e1a0b13a558ff19eeb2c4f0cbe
+  URL "http://downloads.sourceforge.net/project/boost/boost/1.69.0/boost_1_69_0.tar.bz2"
+  URL_MD5 a1332494397bf48332cb152abfefcec2
   BINARY_DIR ${BOOST_SB_BUILD_DIR}
   INSTALL_DIR ${SB_INSTALL_PREFIX}
   DOWNLOAD_DIR ${DOWNLOAD_LOCATION}
@@ -96,7 +96,7 @@ ExternalProject_Add(BOOST
 #HINT: avoid all uses of  _SB_* in External_<project>.cmake
 # and depend on much saner CMAKE_PREFIX_PATH for cmake projects.
 if(MSVC)
-  set(_SB_Boost_INCLUDE_DIR ${SB_INSTALL_PREFIX}/include/boost-1_60)
+  set(_SB_Boost_INCLUDE_DIR ${SB_INSTALL_PREFIX}/include/boost-1_69)
 else()
   set(_SB_Boost_INCLUDE_DIR ${SB_INSTALL_PREFIX}/include)
 endif()