[clang] [BPF] make __BPF_FEATURE_MAY_GOTO available for cpuv1 (PR #108071)

[via cfe-commits]

eddyz87 wrote:

@4ast,

> why force users to specify -mcpu=v4 ? may_goto and addr_cast are fine with v1.

Ok, then this is exactly what this pull request does (allows may_goto for v1).

https://github.com/llvm/llvm-project/pull/108071