[Patch-gnuradio] fix for make check on Cygwin and MinGW/MSYS

[Don Ward]

Here is a simple patch so that "make check" in howto-write-a-block will find 
the DLLs it needs on Cygwin and MSYS.  I have also guessed at what is needed 
for OSX.  The diff file may contain CRLF line terminators; my apologies if 
they cause problems.

-- Don W.

htwab-run_tests.in.diff
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