Start moving functions from win/lib/rlz_lib.h to lib/rlz_lib.h

Start with SetAccessPointRlz() and GetAccessPointRlz(). Add storage
functions for these to RlzValueStore.

No intended behavior change.
Review URL: https://codereview.appspot.com/5814044

git-svn-id: http://rlz.googlecode.com/svn/trunk@75 10bc0f33-e4bf-9a86-80cf-af638054f0c4