MFC r322668,r324239,r324240,r324422,r324476,r324688:

FreeBSD 11.1 release added.

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r324239 | maxim | 2017-10-03 13:31:22 +0000 (Tue, 03 Oct 2017) | 2 lines

FreeBSD 10.4 release added.

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r324240 | maxim | 2017-10-03 14:23:49 +0000 (Tue, 03 Oct 2017) | 5 lines

o FreeBSD 10.4 happened after 11.1, adjust the branches accordingly.
o The current FreeBSD branch is 12 not 13.

Suggested by: lidl

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r324422 | eadler | 2017-10-09 04:43:05 +0000 (Mon, 09 Oct 2017) | 2 lines

Add macOS 10.13

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r324476 | eadler | 2017-10-10 05:47:10 +0000 (Tue, 10 Oct 2017) | 2 lines

Add OpenBSD 6.2, reorder macOS 10.13

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r324688 | maxim | 2017-10-17 14:37:12 +0000 (Tue, 17 Oct 2017) | 2 lines

DragonFly 5.0.0 release added.