updated for version 7.4.261
Problem:    When updating the window involves a regexp pattern, an interactive
	    substitute to replace a "\n" with a line break fails. (Ingo
	    Karkat)
Solution:   Set reg_line_lbr in vim_regsub() and vim_regsub_multi().
Added tag v7-4-261 for changeset 43c6cd07c8de