Use recommended GSL linkage for openblas.

[jeromekelleher]

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.

Following up on #37, try to resolve linkage errors in #34 by using the recommended recipe for linking GSL against alternative BLAS implementations.

@duncanmmacleod: I just thought I'd try this out and see what breaks.

[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.

[jeromekelleher]

Cool, looks like this builds! @duncanmmacleod, would you mind trying this out on your local build to see if it fixes your linking problems?

@isuruf, what do you think, are you OK with changing the linking like this?

If we agree this is a good way to go I'll render the feedstock later before merging. Just wanted to keep the diff minimal for review purposes for the moment.

[duncanmmacleod]

@jeromekelleher, this failed to link for me, much earlier than it used to:

dyld: Library not loaded: @rpath/libgsl.23.dylib
  Referenced from: /Users/duncan/opt/miniconda3/conda-bld/lal_1545399317005/work/./conftest
  Reason: image not found

[jeromekelleher]

@jeromekelleher, this failed to link for me, much earlier than it used to:

Ah OK, looks like there's some mac stuff going on. It was worth a try anyway. Let's see what the others think --- probably your PR is the way to go.

[jakirkham]

Looks like PR ( https://github.com/conda-forge/gsl-feedstock/pull/37 ) was merged. Is this still needed?

[jeromekelleher]

Closing this as #37 fixes our problems.