devel/juce: fix build on powerpc*

/wrkdirs/usr/ports/devel/juce/work/JUCE-7.0.6/modules/juce_dsp/containers/juce_AudioBlock_test.cpp:32:34: error: no template named 'SIMDRegister'
String& operator<< (String& str, SIMDRegister<SampleType>) { return str; }