Do not execute concurrent/MultisetSemaphoreTest

This test is flaky (see #2068) and flakiness support does not work (#540) so exclude it from running on ci.bazel.io

--
PiperOrigin-RevId: 143173700
MOS_MIGRATED_REVID=143173700
diff --git a/src/test/java/com/google/devtools/build/lib/BUILD b/src/test/java/com/google/devtools/build/lib/BUILD
index 3f4392e..0e24181 100644
--- a/src/test/java/com/google/devtools/build/lib/BUILD
+++ b/src/test/java/com/google/devtools/build/lib/BUILD
@@ -132,9 +132,11 @@
             "vfs/*.java",
             "vfs/inmemoryfs/*.java",
         ],
-        # java_rules_skylark doesn't support resource loading with
-        # qualified paths.
         exclude = [
+            # TODO(#2068): Deflake this test or reactivate once #540 is fixed.
+            "concurrent/MultisetSemaphoreTest.java",
+            # java_rules_skylark doesn't support resource loading with
+            # qualified paths.
             "util/ResourceFileLoaderTest.java",
         ] + ALL_WINDOWS_TESTS,
     ),