liblog: don't destroy global mutexes

Some objects may log when they're destructed, so don't destroy the
global std::mutex in fake_log_device.cpp.

Test: AAPT works with a log in VectorImpl::finish_vector()
Change-Id: Ie5a0ac9fc4e6a137e9516059a831e499d55d5ddb
2 files changed
tree: 56d59dec5ba492d95cba62b67a142ecbb68e327b
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/