Mahmoud Al-Qudsi 6c5e5d35a9 Add real completions for ./configure
This relies on the new `read --line/-L` support as an entire parser for
the output of `./configure --help`  was written in fishscript. Also
doesn't work without 72f32e6d8a7905b064680ec4b578c41dea62bf84.

The completion script is slow... a function of both the autotools
configure script itself being written in a shell script combined with a
fishscript output parser.

fish's own `./configure --help` takes around 350ms to execute, while
`__fish_parse_configure ./configure` (which runs that behind the scenes)
takes around 660ms to run, all-in-all - a not insignificant overhead.

Output can be cached (based off of ./configure hash or mtime) in the
future if this is a big deal.
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