Only disable test on OS X. Refs #5304

A test that was disabled everywhere was accidentally reenabled in
f70a161. This commit enables it for everything
except OS X until it is fixed on that platform.

Code/Mantid/Framework/CurveFitting/test/IkedaCarpenterPVTest.h

@@ -112,6 +112,9 @@ class IkedaCarpenterPVTest : public CxxTest::TestSuite
   // here tries to fit an IC peak to a Gaussian mock data peak
   void testAgainstMockData()
   {
+    // Needs fixing on OS X, but keep alive for other platforms so we know if it fails for some other reason
+#ifndef __APPLE__
+
     Fit alg2;
     TS_ASSERT_THROWS_NOTHING(alg2.initialize());
     TS_ASSERT( alg2.isInitialized() );
@@ -203,6 +206,7 @@ class IkedaCarpenterPVTest : public CxxTest::TestSuite
     TS_ASSERT( categories[0] == "Peak" );
 
     AnalysisDataService::Instance().remove(wsName);
+#endif
   }