perf/urgent fixes:

User visible:

- Fix AArch64 objdump disasm comment char in 'perf annotate' (Kim Phillips)

- Fix documentation spelling mistakes (Kim Phillips)

- Don't fail 'perf test kmod-path' if compressed modules aren't
  supported (Kim Phillips)

Infrastructure:

- Fix sched_getcpu feature test when included in test-all.c redefining
  _GNU_SOURCE (Arnaldo Carvalho de Melo)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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