Rebuild for new fontconfig macOS dylib compatibility version

[pkgw]

Cf conda-forge/fontconfig-feedstock#54 — changing the build system for Fontconfig dropped the fontconfig dylib's compatibility version, requiring users to rebuild.

I also made a few fixes to the build system that were exposed while testing the update.

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• 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.

[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.

I do have some suggestions for making it better though...

For recipe:

• License is not an SPDX identifier (or a custom LicenseRef) nor an SPDX license expression.

Documentation on acceptable licenses can be found here.

[jakirkham]

Thoughts @conda-forge/openmotif? 🙂

[epruesse]

Looks good to me. Thanks for all the work. Will squash and merge.