autotools: be more templated when getting list of doc dist files

Distribute asciidoc sources for all manpages instead of remembering to
add files to both variables. Fixes regression in
377d47142f7aaa01ca782e6587f2d4caf663865b which broke building the
website from a dist tarball:

make: *** No rule to make target 'pacman-conf.8.html', needed by 'html'.  Stop.

(Technically this regression is already fixed by commit
942b909829d529409216939b36af11e8480726f5, but this is just going to keep
happening, I suspect, so we should fix the root cause.)

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>

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