USE_PACKAGE_DEPENDS_ONLY set - not building missing dependency from source

[Jan Beich]

pkg-fallout at FreeBSD.org writes:

> Ident:          $FreeBSD: head/multimedia/vapoursynth/Makefile 415615 2016-05-22 01:10:34Z jbeich $
> Log URL:        http://beefy5.nyi.freebsd.org/data/101i386-default/417455/logs/vapoursynth-r32.log
> Build URL:      http://beefy5.nyi.freebsd.org/build.html?mastername=101i386-default&build=417455
> Log:
>
> build started at Sat Jun 25 02:32:41 UTC 2016
[...]
> =======================<phase: build-depends  >============================
> ===>   vapoursynth-r32 depends on executable: sphinx-build - not found
> ===>   vapoursynth-r32 depends on package: /packages/All/py34-sphinx-1.4.4.txz - not found
> ===>   USE_PACKAGE_DEPENDS_ONLY set - not building missing dependency from source
> *** Error code 1

I'm starting to get failures for a port that hasn't changed for a month.
Anyone got a clue? The regression appears to be from r417413 which landed
without an exp-run suggesting any fallout is due to badly written ports.
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