ENH: add RC stuff to main tree

CMakeLists.txt

@@ -355,6 +355,10 @@ IF(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
   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}.${CMake_VERSION_PATCH}")
+  IF(CMake_VERSION_RC)
+    SET(CPACK_SOURCE_PACKAGE_FILE_NAME
+      "${CPACK_SOURCE_PACKAGE_FILE_NAME}-RC-${CMake_VERSION_RC}")
+  ENDIF(CMake_VERSION_RC)
   IF(NOT DEFINED CPACK_SYSTEM_NAME)
     SET(CPACK_SYSTEM_NAME ${CMAKE_SYSTEM_NAME}-${CMAKE_SYSTEM_PROCESSOR})
   ENDIF(NOT DEFINED CPACK_SYSTEM_NAME)