Add couchdb 3.1.1

[joaohf]

Based on the initial recipe [1]. couchdb prefers embedded an erts and
reltool needs to be patched up (root_dir and excl_sys_filters) in order
to use the cross compiled erts.

Important: couchdb supports the following erlang versions:

(19.x, 20.x >= 21.3.8.5, 21.x >= 21.2.3, 22.x >= 22.0.5)

So, consider using a supported version as PREFERRED_VERSION. Like this:

PREFERRED_VERSION_erlang = "22.3"
PREFERRED_VERSION_erlang-native = "22.3"

Thanks @jpnurmi for the initial work and tests.

1: #54

closes: #54

[joaohf]

@jpnurmi, I need to run more tests. At least the recipe works. I mean, no package or compile errors.

I just fixed the reltool.config (http://erlang.org/doc/man/reltool.html) adding the root_dir and excluding the static libraries from the final release.

I'll run couchdb using qemu and see the results.

couchdb ships an ERTS together with the final release. This is a good approach. But, for the meta-erlang I would like to see an additional option that is to use the erts from the image.

[jpnurmi]

@joaohf So cool, thanks for taking the time! I'm also going to give it a spin! ;)

[jpnurmi]