Add krunkit support on MacOS

[germag]

Currently, on macos we use QEMU to run bootc VMs. Supporting krunkit will allow us to use virtiofs and GPU sharing.
What was stopping us from using krunkit is the lack of smbios OEM string support, but hopefully that will be sorted out soon[0, 1]

[0] containers/krunkit#9
[1] containers/libkrun#187