patch 7.4.1459

Problem:    MS-Windows doesn't know socklen_t.
Solution:   Use previous method for WIN32.

patch 7.4.1458

Problem:    When a JSON channel has a callback it may never be cleared.
Solution:   Do not write "DETACH" into a JS or JSON channel.

patch 7.4.1457

Problem:    Opening a channel with select() is not done properly.
Solution:   Also used read-fds. Use getsockopt() to check for errors. (Ozaki
            Kiichi)

patch 7.4.1456

Problem:    Test 87 fails with Python 3.5.
Solution:   Work around difference. (Taro Muraoka)

patch 7.4.1455

Problem:    JSON decoding test for surrogate pairs is in the wrong place.
Solution:   Move the test lines. (Ken Takata)

patch 7.4.1454

Problem:    The exit callback test is flaky.
Solution:   Loop to wait for a short time up to a second.

patch 7.4.1453

Problem:    Missing --not-a-term.
Solution:   Add the argument.

patch 7.4.1452

Problem:    When a callback adds a syntax item either the redraw doesn't
            happen right away or in the GUI the cursor is in the wrong
            position for a moment. (Jakson Alves de Aquino)
Solution:   Redraw after the callback was invoked.

patch 7.4.1451

Problem:    Vim hangs when a channel has a callback but isn't referenced.
Solution:   Have channel_unref() only return TRUE when the channel was
            actually freed.

patch 7.4.1450

Problem:    Json encoding still fails when encoding is not utf-8.
Solution:   Set 'encoding' before :scriptencoding.  Run the json test
            separately to avoid affecting other tests.