Note that this is for bionic headers to be consistent with 64-bit
headers tentatively placed at android-20. ie.
1. bionic headers in all the existing 32-bit headers android-3 .. 19
are consistent, and don't track any new development in bionic/
since JB (the time when significant refactoring work starts in bionic/)
unless bug fixes.
2. bionic headers in android-20 tracks bionic/
Change-Id: Ia07f04ac03ffaef6a6ddcea5f0e6b891e21a869a
79d3fcb11e