Add libidn11

[epruesse]

Libidn is a package for internationalized string handling based on the
Stringprep, Punycode, IDNA and TLD specifications.

• It's in bioconda, but missing in conda.
• Using libidn11 as package name to reflect so-version and avoid run-time binding issues at a later time.
• Name also avoids override by weirdly versioned bioconda package (7.x).

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I wanted to let you know that I linted all conda-recipes in your PR (recipes/libidn) and found some lint.

Here's what I've got...

For recipes/libidn:

• The recipe could do with some maintainers listed in the extra/recipe-maintainers section.
• There are 1 too many lines. There should be one empty line at the end of the file.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipes/libidn) and found it was in an excellent condition.

[epruesse]

@conda-forge/core Ready for review :)

[epruesse]

Just noticed that AppVeyor didn't run. Will push dummy commit to try triggering it. If it doesn't work -- defer win support to feedstock?

[epruesse]

Re win: waiting to see what AppVeyor does on first commit, only added Maintainer after that.

[scopatz]

Hmm odd, appveyor still didn't run.

[epruesse]

@scopatz It's that thing where it sometimes just doesn't. I need to push a patch anyway: AppVeyor finally ran on an earlier commit and I've got a mistake to fix.

[epruesse]

@conda-forge/core All tests have passed. Can someone review?

[scopatz]

Thanks a ton!