Add fx-gltf

[jeongseok-meta]

Checklist

• [x] Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml".
• [x] License file is packaged (see here for an example).
• [x] Source is from official source.
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• [x] Package does not ship static libraries. If static libraries are needed, follow CFEP-18.
• [x] Build number is 0.
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[conda-forge-webservices[bot]]

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/fx-gltf) and found it was in an excellent condition.

[jeongseok-meta]

@conda-forge/help-c-cpp, ready for review!