The simple approach has not worked.  This hybrid solution should avoid the Windows issues and get us per-run logfiles.

Copy3rdPartyLibs needed to copy the now-corrected fmodexL libraries
and it had a bad library reference on Linux for release.  In
llaudio land, the audio engine interfaces, even the fmodex
specializations, seem to want to be external-structure free
so use a forward declaration and pointer to FMOD_DSP_DESCRIPTION
and deal with it in the ctor/dtor.

Two problems found in DLL involving threads.  First, DllMain
was reinitializing a critical section for all entry reasons
(process attach, detach and thread attach, detach).  Should
only be done on process attach.  Second, static container
object was being modified and accessed without serialization.
Added some double-check locking to the initialization path
to reduce the total number of serialization calls made while
making the code thread safe.