perf/urgent fixes:

- Do not access outside hw cache name arrays (Arnaldo Carvalho de Melo)

- Use addr_location::addr instead of ip for entries when unwinding using
  DWARF CFI, fixing the "srcline" information for userspace application
  callchains (Milian Wolff)

- Reinstate strlcpy() header guard with __UCLIBC__, fixing the build
  with uclibc, detected when building for the ARC architecture (Vineet Gupta)

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