[Chapel Merge] Skip this test on cygwin

Branch: refs/heads/master
Revision: 475cd47
Author: bradcray
Log Message:

Merge pull request #16436 from bradcray/skip-2-array-radix-on-cygwin

Skip this test on cygwin

[reviewed by @mppf]

With the removal of the single-task optimization in PR #16401 (which
this test relied on heavily), the running time for this test tipped
over the 5-minute mark, presumably due to the higher overhead for
allocating endcounts on Cygwin. This isn’t a particularly important
test to do for cygwin, so skip it.

Modified Files:
M test/library/packages/Sort/correctness/two-array-radix-sort-bug.skipif

Compare: https://github.com/chapel-lang/chapel/compare/e7d346e1e032...475cd47c6bec