thirdparty: update bundled SIMDE to fix link error on musl/non-glibc

[kjg0724]

Reopens #682.

Accidentally closed the previous PR — apologies for the confusion.

Updates thirdparty/simde to simd-everywhere/simde@cb5b957, which includes:

• roundeven/roundevenf guard (math: guard __builtin_roundeven against non-glibc platforms simd-everywhere/simde#1398)
• exp10/exp10f guard (math: extend non-glibc guard to Clang and add exp10 guard simd-everywhere/simde#1400)

Both fixes address link errors on musl/non-glibc systems. CI was green on #682.

[kjg0724]

Hi @adamjw24 — sorry again for the confusion with #682.

This PR (#684) is identical in content. The only change from #682 is that it's now created from a proper fork.

The core change: SIMDE updated to cb5b957, adding compile-time guards for roundeven and exp10 which caused link errors on musl-based (non-glibc) systems. No logic changes to vvenc itself — purely a bundled dependency update.

Would appreciate a review when you get a chance. Happy to address any feedback.

[K-os]

Thanks, in principle this looks good. I just have one small change request:
We pull the simd-everywhere dependency directly from this repository: https://github.com/simd-everywhere/simde-no-tests.git
So, could you please update the commit message to point to the corresponding commit in that repository to prevent confusion? I think it should be simd-everywhere/simde-no-tests@8574c41

[kjg0724]

Updated the commit message to reference simd-everywhere/simde-no-tests@8574c41 as requested.

[K-os]

Ok, thanks. Looks good now.