updated for version 7.4.062
Problem:    Configure check for AvailabilityMacros.h is wrong.
Solution:   Use AC_CHECK_HEADERS().
Added tag v7-4-062 for changeset d59a0b8e5584
Update runtime files.
updated for version 7.4.063
Problem:    Crash when using invalid key in Python dictionary.
Solution:   Check for object to be NULL.  Add tests. (ZyX)
Added tag v7-4-063 for changeset 9cedb4dfd4c8
updated for version 7.4.064
Problem:    When replacing a character in Visual block mode, entering a CR
	    does not cause a repeated line break.
Solution:   Recognize the situation and repeat the line break. (Christian
	    Brabandt)
Added tag v7-4-064 for changeset d06223965468
updated for version 7.4.065
Problem:    When recording, the character typed at the hit-enter prompt is
	    recorded twice. (Urtica Dioica)
Solution:   Avoid recording the character twice. (Christian Brabandt)
Added tag v7-4-065 for changeset 7f341db39d5b
updated for version 7.4.066
Problem:    MS-Windows: When there is a colon in the file name (sub-stream
	    feature) the swap file name is wrong.
Solution:   Change the colon to "%". (Yasuhiro Matsumoto)
Added tag v7-4-066 for changeset 38b948f534e4
Merge with master.
Auto version upgrade (7.4.066)