Fix snapping test failing on 32-bit platforms (hopefully)

The discrepancy between the results seems to come from floating point
arithmetics (-mfpmath option in GCC) which defaults to different values:
- '387' for i386
- 'sse' for x86-64

The 387 coprocessor temporarily uses 80-bit precision
so the results of arithmetic operations may be a bit different

tests/src/core/testqgssnappingutils.cpp

@@ -110,6 +110,10 @@ class TestQgsSnappingUtils : public QObject
       QVERIFY( !m2.isValid() );
       QVERIFY( !m2.hasVertex() );
 
+      // do not consider edges in the following test - on 32-bit platforms
+      // result was an edge match very close to (1,0) instead of being exactly (1,0)
+      u.setDefaultSettings( QgsPointLocator::Vertex, 10, QgsTolerance::Pixels );
+
       // test with filtering
       FilterExcludePoint myFilter( QgsPoint( 1, 0 ) );
       QgsPointLocator::Match m3 = u.snapToMap( QPoint( 100, 100 ), &myFilter );