[BPF] make __BPF_FEATURE_MAY_GOTO available for cpuv1 (#108071)
For some reason `__BPF_FEATURE_MAY_GOTO` is available for CPUs v{2,3,4}
but is not available for CPU v1. This limitation is arbitrary:
- the instruction is never produced by LLVM backend;
- on Linux Kernel side this instruction is available in kernels that
also support CPUv4.
Hence, it is more consistent to either always allow
`__BPF_FEATURE_MAY_GOTO` or only allow it for CPUv4.
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