Debugger: Disable build-in LLDB formatters for old LLDB

This is kind of hot fix to solve conflicts with Creator's
pretty printing in the LLDB 179.5 context which does not
seem to handle SBValue.SetPreferSyntheticValue.

Change-Id: I9837bd3044a9ec90c67de3060d5895ae0b6b8653
Reviewed-by: hjk <hjk121@nokiamail.com>