openlibm 0.8.4

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Created by brew bump

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Created with brew bump-formula-pr.

release notes

## What's Changed
* CMake changes: Long double/double size detection, Android x86 and armv7 support, install pkg-config pc file by @ViliusSutkus89 in https://github.com/JuliaMath/openlibm/pull/304
* CMake Changes by @theoparis in https://github.com/JuliaMath/openlibm/pull/299
* Add stack markings for GNU to fmod assembly files by @jsmolic in https://github.com/JuliaMath/openlibm/pull/307
* Fix risc-v build by @tea in https://github.com/JuliaMath/openlibm/pull/305
* Fix fenv_t initializer by @000lbh in https://github.com/JuliaMath/openlibm/pull/308
New Contributors

@theoparis made their first contribution in CMake Changes JuliaMath/openlibm#299
@jsmolic made their first contribution in Add stack markings for GNU to fmod assembly files JuliaMath/openlibm#307
@tea made their first contribution in Fix risc-v build JuliaMath/openlibm#305
@000lbh made their first contribution in Fix fenv_t initializer JuliaMath/openlibm#308

Full Changelog: JuliaMath/openlibm@v0.8.3...v0.8.4

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