Pin down libhwloc using run_exports

[stain]

See discussion in https://github.com/bioconda/bioconda-recipes/pull/13523#issuecomment-461108104

max_pin='x.x' should hopefully do it - it is a bit aggressive for 1.x series as version 1.11.9 has libhwloc.so.5 (consistent since perhaps 1.4) - meanwhile 2.0.2 is already at libhwloc.so.15 so better play safe.

BTW, this recipe might need a folder split for 1.11 (now "ultra-stable") and 2.0 to add the later versions 1.11.10, 1.11.11 and/or 1.11.12 as well as 2.0.3 hinted at in #17.

Checklist

• [x] Used a fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [ ] Reset the build number to 0 (if the version changed)
• [ ] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [ ] Ensured the license file is being packaged.

[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 (recipe) and found it was in an excellent condition.

[stain]

Actually version 2.0.0 in conda has libhwloc.so.12, so we would need even tighter pinning x.x.x for 2.x and looser for 1.x. I'll make a separate PR to re-add 1.x for its latest updates with looser pinning.