updated for version 7.4.474
Problem:    AIX compiler can't handle // comment.  Issue 265.
Solution:   Remove that line.
Added tag v7-4-474 for changeset 7f2472960aa1
updated for version 7.4.475
Problem:    Can't compile on a system where Xutf8SetWMProperties() is not in
	    the X11 library.  Issue 265.
Solution:   Add a configure check.
Added tag v7-4-475 for changeset 0446fa17bd95
Merge remote-tracking branch 'vim-clone/master' into bleeding-edge