Rename rlz_lib2.cc and win/lib/rlz_lib.cc to win/lib/rlz_lib_win.cc

BUG=none
TEST=none
TBR=rogerta

Review URL: https://codereview.appspot.com/5875051

git-svn-id: http://rlz.googlecode.com/svn/trunk@113 10bc0f33-e4bf-9a86-80cf-af638054f0c4