message: [CMake] Don't force some CMake variables
diff: @@ -18,9 +18,9 @@ set(LLDB_VERSION_PATCH 1 CACHE STRING "" FORCE)
  set(LLDB_VERSION_SUFFIX svn CACHE STRING "" FORCE)
  if(APPLE)
  - set(LLDB_USE_SYSTEM_DEBUGSERVER ON CACHE BOOL "" FORCE)
  - set(LLDB_BUILD_FRAMEWORK ON CACHE BOOL "" FORCE)
  - set(LLDB_FRAMEWORK_TOOLS ${swift_lldb_framework_tools} CACHE STRING "" FORCE)
  + set(LLDB_USE_SYSTEM_DEBUGSERVER ON CACHE BOOL "")
  + set(LLDB_BUILD_FRAMEWORK ON CACHE BOOL "")
  + set(LLDB_FRAMEWORK_TOOLS ${swift_lldb_framework_tools} CACHE STRING "")
  endif()
  if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
  