cppunittest_filter_xslt: fix "filter_xslt unit test failed" for OSX <10.6

For now, just disable this test on OSX <10.6.

Change-Id: I5f41f0d0dc3d6c48d27f5276268af3b47a71c7fc
Reviewed-on: https://gerrit.libreoffice.org/10458
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

filter/qa/cppunit/xslt-test.cxx

@@ -46,8 +46,10 @@ public:
     void testXsltCopyNew();
 
     CPPUNIT_TEST_SUITE(XsltFilterTest);
+#if !(defined(MACOSX) && (MACOSX_SDK_VERSION < 1060))
     CPPUNIT_TEST(testXsltCopyOld);
     CPPUNIT_TEST(testXsltCopyNew);
+#endif
     CPPUNIT_TEST_SUITE_END();
 };