configure: move the hardware accel libs' entries in the help text

Group them in a subsection of the external library section. That should
make them easier to find and understand how they fit in the scheme of
things.

Also, rewrite the description text in a similar way as in the previous
commit.
pull/221/head
Anton Khirnov 9 years ago
parent 5e2203448a
commit c0f4c7db9f
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