FEXLoader: Increase minimum kernel requirement from 5.0 to 5.15 #4245
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Brought up in #4225 where it had issues with Openat2 which was added in 5.8.
The main driving force around minimum kernel version requirement is that the lowest kernel version in our CI is 5.15. A benefit to this choice is that this is an LTS release, which is also what Ubuntu 22.04 is shipping.
Once the single CI machine is fixed to ship something newer then the next logical choice would be kernel 6.1 which is also LTS, but until then just lift it to 5.15. This version was released in October 2021, and is supported by the kernel developers until 2026. Our previous minimum of 5.0 was released in March 2019, so a two year leap here.
This removes the openat2 workaround that was necessary to pass our CI since it is no longer necessary.