meson: OpenMP is supposed to be optional
The code around it checks that it is found, so clearly it was meant to be optional, not required.
Fixes: cd2832ee ("meson: add an optional OpenMP dependency for AMD tests")
The code around it checks that it is found, so clearly it was meant to be optional, not required.
Fixes: cd2832ee ("meson: add an optional OpenMP dependency for AMD tests")