updated for version 7.4.381

Problem:    Get u_undo error when backspacing in Insert mode deletes more than
            one line break. (Ayberk Ozgur)
Solution:   Also decrement Insstart.lnum.

src/edit.c

@@ -8833,6 +8833,7 @@ ins_bs(c, mode, inserted_space_p)
 		return FALSE;
 	    --Insstart_orig.lnum;
 	    Insstart_orig.col = MAXCOL;
+	    Insstart = Insstart_orig;
 	}
 	/*
 	 * In replace mode:

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    381,
 /**/
     380,
 /**/