[PD] IEMlibs now part of pd-externals

[Hans-Christoph Steiner]

I imported the IEMlib into the CVS and was able to incorporate all of 
its non-conflicting objects into the pd-externals build system without 
modifying the IEMlib sources at all.  So now all of the IEMlib objects, 
including [mp3play~] and the t3 objects, will be incorporated in the 
packages as individual objects.

This makes me happy, no more conflicts!

.hc