Add vendor_available to liblog_headers. am: 9b999ca600  -s ours
am: a9f9294831  -s ours

Change-Id: I9e27513c8fbdd9413381dc51fe49f57fe74ad4b3
tree: 7e94fe1e6efe9ede8834e70bab5d3db4432af931
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/