[FIX] sys-config: Merge prefs from tiki.ini into $needed_prefs early in setup-base, so you can change caching settings from there in time.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/11.x@46401 b456876b-0849-0410-b77d-98878d47e9d5