ENH: update cpack stuff to match old cmake releases

CMakeLists.txt

@@ -242,7 +242,20 @@ IF(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
   SET(CPACK_PACKAGE_VERSION_MAJOR "${CMake_VERSION_MAJOR}")
   SET(CPACK_PACKAGE_VERSION_MINOR "${CMake_VERSION_MINOR}")
   SET(CPACK_PACKAGE_VERSION_PATCH "${CMake_VERSION_PATCH}")
-
+  SET(CPACK_PACKAGE_INSTALL_DIRECTORY "CMake ${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}")
+  SET(CPACK_SOURCE_PACKAGE_FILE_NAME
+    "cmake-${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}.${CMake_VERSION_PATCH}")
+  SET(CPACK_SYSTEM_NAME ${CMAKE_SYSTEM_NAME})
+  IF(${CMAKE_SYSTEM_NAME} MATCHES Windows)
+    IF(CMAKE_CL_64)
+      SET(CPACK_SYSTEM_NAME win64)
+    ELSE(CMAKE_CL_64)
+      SET(CPACK_SYSTEM_NAME win32)
+    ENDIF(CMAKE_CL_64)
+  ENDIF(${CMAKE_SYSTEM_NAME} MATCHES Windows)
+
+    
+  SET(CPACK_PACKAGE_FILE_NAME "${CPACK_SOURCE_PACKAGE_FILE_NAME}-${CPACK_SYSTEM_NAME}")
   IF(WIN32 AND NOT UNIX)
     # There is a bug in NSI that does not handle full unix paths properly. Make
     # sure there is at least one set of four (4) backlasshes.