audio/inscore: fix build on powerpc64
Doesn't correctly detect endianness:
In file included from /wrkdirs/usr/ports/audio/inscore/work/inscore-128/lib/oscpack/osc/OscOutboundPacketStream.cpp:41:
/wrkdirs/usr/ports/audio/inscore/work/inscore-128/lib/oscpack/osc/OscHostEndianness.h:64:2: error: please edit OSCHostEndianness.h to configure endianness