updated for version 7.4.083

Problem:    It's hard to avoid adding a used pattern to the search history.
Solution:   Add the ":keeppatterns" modifier. (Christian Brabandt)

src/structs.h

@@ -542,6 +542,7 @@ typedef struct
     int		keepmarks;		/* TRUE when ":keepmarks" was used */
     int		keepjumps;		/* TRUE when ":keepjumps" was used */
     int		lockmarks;		/* TRUE when ":lockmarks" was used */
+    int		keeppatterns;		/* TRUE when ":keeppatterns" was used */
 # ifdef FEAT_AUTOCMD
     char_u	*save_ei;		/* saved value of 'eventignore' */
 # endif