GitHub issue #205. Fixed AsyncAppender shutdown crash.
Fix GitHub bug #195. Check if queue thread pointer is not NULL and if it
is running before trying to join it.
Fixed GitHub bug #136. Adjust weekly, daily and twice daily rollover time
for DailyRollingFileAppender by time zone offset so that the rollover
happens at midnight, etc., of local time instead of UTC time.
Fixed GitHub bug #148. TTCCLayout boolean members could be left
uninitialized. Initialize them.
Fixed GitHub bug #163. Fixed Visual Studio 2015 build with
CMake. Compilation fails not finding FreeAddrInfoW().
Disabled use of __thread on iOS.
Fixed SF#333. AsyncAppender's appenders need to be closed so that
accumulated logs get flushed onto disk.
Updated android.toolchain.cmake from OpenCV project.
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