Update runtime files.
updated for version 7.4.541
Problem:    Crash when doing a range assign.
Solution:   Check for NULL poiter. (Yukihiro Nakadaira)
Added tag v7-4-541 for changeset 9fbb9c60ab41
updated for version 7.4.542
Problem:    Using a range for window and buffer commands has a few problems.
	    Cannot specify the type of range for a user command.
Solution:   Add the -addr argument for user commands.  Fix problems. (Marcin
	    Szamotulski)
Added tag v7-4-542 for changeset de877dab1c31