coverity/13749: fix negative array index read in unset_global_local_option
vim-patch:7.4.325 #1078

Problem:    When starting the gui and changing the window size the status line
            may not be drawn correctly.
Solution:   Catch new_win_height() being called recursively. (Christian
            Brabandt)

https://code.google.com/p/vim/source/detail?r=1f288d247548
vim-patch:7.4.329 #1079

Problem:    When moving the cursor and then switching to another window the
            previous window isn't scrolled. (Yukihiro Nakadaira)
Solution:   Call update_topline() before leaving the window. (Christian
            Brabandt)

https://code.google.com/p/vim/source/detail?r=018df65085f8