[materialx] Add port MaterialX 1.38.4

[theblackunknown]

Describe the pull request

• What does your PR fix?

This PR adds a new port materialx

• Which triplets are supported/not supported? Have you updated the CI baseline?

All, No

• Does your PR follow the maintainer guide?

Yes

• If you have added/updated a port: Have you run ./vcpkg x-add-version --all and committed the result?

Yes

If you are still working on the PR, open it as a Draft: https://github.blog/2019-02-14-introducing-draft-pull-requests/

[github-actions]

You have modified or added at least one vcpkg.json where you should check the license field.

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• ports/materialx/vcpkg.json

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[theblackunknown]

Committed patch has also been reproted upstream in AcademySoftwareFoundation/MaterialX#940

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You have modified or added at least one vcpkg.json where you should check the license field.

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You have modified or added at least one vcpkg.json where you should check the license field.

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[github-actions]

This is a new experimental fast check for PR issues. Please let us know if this bot is helpful!

PRs must add only one version and must not modify any published versions

When making any changes to a library, the version or port-version in vcpkg.json or CONTROL must be modified.

Error: Local changes detected for materialx but no changes to version or port version.
-- Version: 1.38.4
-- Old SHA: 92c7e8e35595440b7620076f8f000a21d0702e45
-- New SHA: 20b6b3a39d993f3bfb1dc0a1ca06126eb6a91f33
-- Did you remember to update the version or port version?
-- Pass `--overwrite-version` to bypass this check.
***No files were updated.***

[theblackunknown]

@JonLiu1993 everything should now be in order, let me know if we can proceed with the merge

[theblackunknown]

Hi @JonLiu1993 , I have added one last commit as my upstream AcademySoftwareFoundation/MaterialX#940 PR was merged in the meantime and hence I do not need anymore to patch the port

[BillyONeal]

I checked for problematic find_package calls:
documents/CMakeLists.txt has find_package(Doxygen), but that whole CMakeLists.txt is disabled by -DMATERIALX_BUILD_DOCS:BOOL=NO
There are several find_package(pybind11 QUIET) but I'm assuming -DMATERIALX_BUILD_PYTHON:BOOL=NO guards them.

Everything else has REQUIRED :D

[BillyONeal]

Thanks for the new port!

[theblackunknown]

Thanks for checking @BillyONeal !
Indeed I started with as few features as possible, and only then will try to gradually add them while also proposing changes upstream.
Keep an eye on my future PRs !