Expect fewer than MAX_CONCURRENCY threads in test (2)

Change-Id: I895ae4dea12e66fcbd0f4635c6ba5915d0431187
Reviewed-on: https://gerrit.libreoffice.org/26346Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>

comphelper/qa/unit/threadpooltest.cxx

@@ -44,7 +44,7 @@ void ThreadPoolTest::testPreferredConcurrency() {
     // Revert and check. Again, nothing should change.
     unsetenv("MAX_CONCURRENCY");
     nThreads = comphelper::ThreadPool::getPreferredConcurrency();
-    CPPUNIT_ASSERT_EQUAL(nExpected, nThreads);
+    CPPUNIT_ASSERT_MESSAGE("Expected no more than 4 threads", nExpected >= nThreads);
 #endif
 }