tools/lib/bpf: fix -Wdiscarded-qualifiers under C23#6438

kernel-patches-daemon-bpf-rc[bot] wants to merge 1 commit intobpf-next_basekernel-patches/bpf-rc:bpf-next_basefrom

series/1028705=>bpf-nextkernel-patches/bpf-rc:series/1028705=>bpf-nextCopy head branch name to clipboard