[FFmpeg-devel] [PATCH] configure: <fflib>_deps: validate, reduce sensitivity

[avih]

I analyzed the linkage failures at:
http://ffmpeg.org/pipermail/ffmpeg-devel/2018-August/233674.html

After finding their immediate cause - expecting a specific output
order from unique() - I realized that there might be a related issue
where devs are expected to maintain <fflib>_deps (e.g. avfilter_deps)
in linking order. This can be awkward and bug-prone if the list is
not empty. I noticed at least one such existing order bug.

This patch makes it easier to add to these lists, in any order,
while also addressing few smaller issues and adding validation.

More details at the commit message of the attached patch.

Avi
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