Send all protobuf logging to logcat by default on Android

Currently the default for protobuf on Android is to silently drop all log
messages. This makes debugging difficult because things like GOOGLE_LOG(FATAL)
will crash the process without actually logging a useful error.

This CL changes the logging so that by default we send messages for all log
levels to logcat (and stderr). Users can override this by setting
GOOGLE_PROTOBUF_MIN_LOG_LEVEL. Also, that option was not being respected for
non-Android platforms so I went ahead and fixed that to make things consistent.

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