[Patch-gnuradio] fixes for gr-uhd and gr-audio on Cygwin/MinGW

[Don Ward]

Both gr-{uhd,audio}/lib/Makefile.am need $(NO_UNDEFINED) added to build 
dynamic libraries (.dll) instead of static libraries (.a) on Cygwin and 
MinGW.  Patch is attached.

And isn't this (no shared libraries built) the kind of thing that should be 
detected by test cases in make check?

-- Don W.

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