patch 8.0.0587: configure check for return value of tgetent skipped

Problem:    Configure check for return value of tgetent is skipped.
Solution:   Always perform the check. (Marvin Schmidt, closes vim#1664)

patch 8.0.0586: no test for mapping timing out

Problem:    No test for mapping timing out.
Solution:   Add a test.

patch 8.0.0585: test_options fails when run in the GUI

Problem:    Test_options fails when run in the GUI.
Solution:   Also check the 'imactivatekey' value when the GUI is not running.
            Specify test values that work and that fail.

patch 8.0.0584: memory leak when executing quickfix tests

Problem:    Memory leak when executing quickfix tests.
Solution:   Free the list reference. (Yegappan Lakshmanan)

patch 8.0.0583: fold test hangs on MS-Windows

Problem:    Fold test hangs on MS-Windows.
Solution:   Avoid overflow in compare.

patch 8.0.0582: illegal memory access with z= command

Problem:    Illegal memory access with z= command. (Dominique Pelle)
Solution:   Avoid case folded text to be longer than the original text.  Use
            MB_PTR2LEN() instead of MB_BYTE2LEN().

patch 8.0.0581: moving folded text is sometimes not correct

Problem:    Moving folded text is sometimes not correct.
Solution:   Bail out when "move_end" is zero. (Matthew Malcomson)

patch 8.0.0580: cannot set the valid flag with setqflist()

Problem:    Cannot set the valid flag with setqflist().
Solution:   Add the "valid" argument. (Yegappan Lakshmanan, closes vim#1642)

patch 8.0.0579: duplicate test case for quickfix

Problem:    Duplicate test case for quickfix.
Solution:   Remove the function. (Yegappan Lakshmanan)

patch 8.0.0578: :simalt on MS-Windows does not work properly

Problem:    :simalt on MS-Windows does not work properly.
Solution:   Put something in the typeahead buffer. (Christian Brabandt)