temp: omit conc063 on Windows to avoid hanging the build

testsuite/tests/ghc-regress/concurrent/should_run/all.T

@@ -140,7 +140,16 @@ clean(['conc059_c.o'])
 test('conc060', normal, compile_and_run, ['-package stm'])
 test('conc061', normal, compile_and_run, ['-package stm'])
 test('conc062', normal, compile_and_run, ['-package stm'])
-test('conc063', exit_code(1), compile_and_run, ['-package stm'])
+
+# omit conc063(ghci) on Windows for now; it hangs and doesn't get killed by 
+# the timeout program, and it holds up the entire run.
+if config.platform == "i386-unknown-mingw32":
+    config063 = omit_ways(['ghci'])
+else:
+    config063 = normal
+
+test('conc063', compose(exit_code(1), config063), 
+        compile_and_run, ['-package stm'])
 
 test('conc064', exit_code(1), compile_and_run, [''])