updated for version 7.4.055
Problem:    Mac: Where availability macros are defined depends on the system.
Solution:   Add a configure check. (Felix Bünemann)
Added tag v7-4-055 for changeset 38a755adc580
updated for version 7.4.056
Problem:    Mac: Compilation problem with OS X 10.9 Mavericks.
Solution:   Include AvailabilityMacros.h when available. (Kazunobu Kuriyama)
Added tag v7-4-056 for changeset 8d83c219fc7b
updated for version 7.4.057
Problem:    byteidx() does not work for composing characters.
Solution:   Add byteidxcomp().
Added tag v7-4-057 for changeset 3109053ce4e3
updated for version 7.4.058
Problem:    Warnings on 64 bit Windows.
Solution:   Add type casts. (Mike Williams)
Added tag v7-4-058 for changeset fa8447ec5823
updated for version 7.4.059
Problem:    set_last_cursor() may encounter w_buffer being NULL.  (Matt
	    Mkaniaris)
Solution:   Check for NULL.
Added tag v7-4-059 for changeset 2a72805a3038
updated for version 7.4.060
Problem:    Declaration has wrong return type for PyObject_SetAttrString().
Solution:   Use int instead of PyObject. (Andreas Schwab)
Added tag v7-4-060 for changeset 46ca8fcee525
updated for version 7.4.061
Problem:    Availability macros configure check in wrong place.
Solution:   Also check when not using Darwin. Remove version check.
Added tag v7-4-061 for changeset 739074bdceb8