updated for version 7.4.486
Problem:    Check for writing to a yank register is wrong.
Solution:   Negate the check. (Zyx).  Also clean up the #ifdefs.
Added tag v7-4-486 for changeset b8caf7045e3d
updated for version 7.4.487
Problem:    ":sign jump" may use another window even though the file is
	    already edited in the current window.
Solution:   First check if the file is in the current window. (James McCoy)
Added tag v7-4-487 for changeset 1f9577e9ef1b
Add the missing test files.
updated for version 7.4.488
Problem:    test_mapping fails for some people.
Solution:   Set the 'encoding' option. (Ken Takata)
Added tag v7-4-488 for changeset 3ec6e0ef4a67