Fix qgsrasterlayer tests under GDAL >= 2.0

Author: nyalldawson

tests/src/core/testqgsrasterlayer.cpp

@@ -390,12 +390,11 @@ void TestQgsRasterLayer::checkStats()
   //QVERIFY( myStatistics.elementCount == 100 );
   QVERIFY( myStatistics.minimumValue == 0 );
   QVERIFY( myStatistics.maximumValue == 9 );
-  QVERIFY( myStatistics.mean == 4.5 );
+  QVERIFY( qgsDoubleNear( myStatistics.mean, 4.5 ) );
   double stdDev = 2.87228132326901431;
   // TODO: verify why GDAL stdDev is so different from generic (2.88675)
   mReport += QString( "stdDev = %1 expected = %2<br>\n" ).arg( myStatistics.stdDev ).arg( stdDev );
-  QVERIFY( fabs( myStatistics.stdDev - stdDev )
-           < 0.0000000000000001 );
+  QVERIFY( qgsDoubleNear( myStatistics.stdDev, stdDev, 0.00000000000001 ) );
   mReport += "<p>Passed</p>";
 }