Fix qhull not being found

[Tobias-Fischer]

Checklist

• Used a personal fork of the feedstock to propose changes
• 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 @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

Fix #29

[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.

[Tobias-Fischer]

@conda-forge-admin, please rerender

[conda-forge-linter]

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

I was trying to look for recipes to lint for you, but it appears we have a merge conflict.
Please try to merge or rebase with the base branch to resolve this conflict.

Please ping the 'conda-forge/core' team (using the @ notation in a comment) if you believe this is a bug.

[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.

[Tobias-Fischer]

qhull is now found correctly after pinning:

-- Found Qhull: optimized;$PREFIX/lib/libqhull_p.so;debug;$PREFIX/lib/libqhull_p.so  
-- QHULL found (include: $PREFIX/include, lib: optimized;$PREFIX/lib/libqhull_p.so;debug;$PREFIX/lib/libqhull_p.so)

I would say let's merge this, and then we can remove the pin once conda-forge/qhull-feedstock#12 is resolved

[Tobias-Fischer]

Thanks to @traversaro's comments in conda-forge/qhull-feedstock#12 I decided to go for the proper fix instead, i.e. backporting PointCloudLibrary/pcl#4540

It finds QHull correctly, let's see whether the build passes.

[Tobias-Fischer]

This is now ready to be merged @hobu @chambbj

[chambbj]

Thanks again @Tobias-Fischer. Glad to see this is at least on the path to being fixed in PCL already.