test: Give up on cooperative_wait for Windows

Author: eschnett

test/runtests.jl

@@ -112,6 +112,18 @@ testfiles = sort(filter(istest, readdir(testdir)))
                    """ exception=(e, catch_backtrace())
             @test_broken false
         end
+    elseif f == "test_cooperative_wait.jl" && Sys.iswindows()
+        # This test is broken on Windows. We don't know why.
+        try
+            run(cmd())
+        catch e
+            @error """
+                   $(f) tests failed.  Thsi may be because the Windows MPI implementation is quite old;
+                   it appears unsupported and has not seen bug fixes for a long time.
+                   See the full error message for more details.  Some messages may have been written above.
+                   """ exception=(e, catch_backtrace())
+            @test_broken false
+        end
     else
         # MPI_Reduce with MPICH 3.4.2 on macOS when root != 0 and
         # when recvbuf == C_NULL segfaults