Merge changes from topic "liblog"

* changes:
  Whole static link libasync_safe to libbacktrace.a
  libbase uses liblog symbols via dlsym when it is built for APEX

Cr-Mirrored-From: https://chromium.googlesource.com/aosp/platform/system/core
Cr-Mirrored-Commit: ac72606f98da5e5939497b793df518544bfc6f94
1 file changed