am 754c178a: Add qsort_r() implementation to the C library.

Merge commit '754c178ae551aedcbbfd3bfd1c1c3b710d9ad989' into eclair-plus-aosp

* commit '754c178ae551aedcbbfd3bfd1c1c3b710d9ad989':
  Add qsort_r() implementation to the C library.