build: wasm build

[nickdademo]

Description

Tests

Checklist:

• I have read the guidelines on contributions and code review procedures.
• I have read the Policy on AI Coding Assistants
  and if I used AI coding assistants, I have an Assisted-by: TOOL / MODEL
  line in the pull request description above.
• I have updated the documentation if my PR adds features or changes
  behavior.
• I am sure that this PR's changes are tested in the testsuite.
• I have run and passed the testsuite in CI before submitting the
  PR, by pushing the changes to my fork and seeing that the automated CI
  passed there. (Exceptions: If most tests pass and you can't figure out why
  the remaining ones fail, it's ok to submit the PR and ask for help. Or if
  any failures seem entirely unrelated to your change; sometimes things break
  on the GitHub runners.)
• My code follows the prevailing code style of this project and I
  fixed any problems reported by the clang-format CI test.
• If I added or modified a public C++ API call, I have also amended the
  corresponding Python bindings. If altering ImageBufAlgo functions, I also
  exposed the new functionality as oiiotool options.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: nickdademo / name: Nick D'Ademo (938800b)

[lgritz]

LGTM

Note that at present, we don't CI test building for wasm. But if you want to submit a change to the CI scripts to do it (assuming that's possible on GHA), that would be a welcome addition as well.

[nickdademo]

LGTM

Note that at present, we don't CI test building for wasm. But if you want to submit a change to the CI scripts to do it (assuming that's possible on GHA), that would be a welcome addition as well.

Thanks! Good idea - perhaps in a separate follow up PR :)

[pjebs]

@nickdademo PJ from monash. What is this PR for? Are you building something special?