updated for version 7.4.317
Problem:    Crash when starting gvim.  Issue 230.
Solution:   Check for a pointer to be NULL. (Christian Brabandt)
Added tag v7-4-317 for changeset 8ffcb546d782
updated for version 7.4.318
Problem:    Check for whether a highlight group has settings ignores fg and bg
	    color settings.
Solution:   Also check cterm and GUI color settings. (Christian Brabandt)
Added tag v7-4-318 for changeset 5c47dacf397c
updated for version 7.4.319
Problem:    Crash when putting zero bytes on the clipboard.
Solution:   Do not support the utf8_atom target when not using an Unicode
	    encoding. (Naofumi Honda)
Added tag v7-4-319 for changeset a076237d1c38
updated for version 7.4.320
Problem:    Possible crash when an BufLeave autocommand deletes the buffer.
Solution:   Check for the window pointer being valid.  Postpone freeing the
	    window until autocommands are done. (Yasuhiro Matsumoto)
Added tag v7-4-320 for changeset f7bc601823e5
updated for version 7.4.321
Problem:    Can't build with strawberry perl 5.20 + mingw-w64-4.9.0.
Solution:   Define save_strlen. (Ken Takata)
Added tag v7-4-321 for changeset c052937aae8c