Remove WelsStderrSetTraceLevel

The logging level is checked in welsCodecTrace anyway.

Previously, error logging wasn't ever shown if the trace
level was set to WELS_LOG_ERROR (as it was by default),
since welsStderrLevelTrace required the message level to
be strictly lower than the trace level.

codec/common/src/welsCodecTrace.cpp

@@ -108,7 +108,6 @@ void welsCodecTrace::CODEC_TRACE (void* ignore, const int32_t iLevel, const char
 void welsCodecTrace::SetTraceLevel (const int32_t iLevel) {
   if (iLevel >= 0)
     m_iTraceLevel	= iLevel;
-  WelsStderrSetTraceLevel (iLevel);
 }