[C++] Ensure Meson Uses gnu_symbol_visibility: 'inlineshidden'

[WillAyd]

Describe the enhancement requested

I was falsely under the impression that the Meson configuration should be using 'hidden' visibility to hide the most symbols, but it turns out 'inlineshidden' is the best option. See the discussion in google/highway#2641 (comment)

Component(s)

C++

[kou]

Issue resolved by pull request 47413
#47413