Skip test/studies/sort/radix.chpl for cygwin
Skip test/studies/sort/radix.chpl for cygwin

This test takes a very long time on cygwin, even on my personal machine (which
was much faster than our testing system).  The reason is that it creates and
deletes 8 arrays of ~6000 sync variables and takes a very long time to delete
each one (roughly 20 minutes per array).  Since production code is unlikely in
this situation, there's little point running this test.

chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,hildeth/chapel,CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,hildeth/chapel,CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel