various versions of librxtx provided by
www.cloudhopper.com/opensource/rxtx

Thanks cloudhopper!

These binaries are necessary to bundle for 64bit users on windows and
linux. 32bit versions are also provided here for consistency against
the 64 bit versions (rather than whatever rxtx is distributing, which
does not include 64 bit bins).

For more info please visit www.cloudhopper.com/opensource/rxtx