perf util: Remove kernel version deadcode

fetch_kernel_version() has been unused since Ian's 2023 commit
3d6dfae889174340 ("perf parse-events: Remove BPF event support")

Remove it, and it's helpers.

I noticed there are a bunch of kernel-version macros that are also
unused nearby.

Also remove them.

Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Dr. David Alan Gilbert <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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