updated for version 7.4.543
Problem:    Since patch 7.4.232 "1,3s/\n//" joins two lines instead of three.
	    (Eliseo Martínez)  Issue 287
Solution:   Correct the line count. (Christian Brabandt)
	    Also set the last used search pattern.
Added tag v7-4-543 for changeset f673842874b6
updated for version 7.4.544
Problem:    Warnings for unused arguments when compiling with a combination of
	    features.
Solution:   Add "UNUSED".
Added tag v7-4-544 for changeset 89143424f604