Fix wxCHECK_MSG in DRC

The layers check needs to look for testing against technical layers for
those vias that pass the outer layers

pcbnew/drc/drc_test_provider_physical_clearance.cpp

@@ -647,7 +647,18 @@ int DRC_TEST_PROVIDER_PHYSICAL_CLEARANCE::testItemAgainstItem( BOARD_ITEM* aItem
 
         if( aItem->Type() == PCB_VIA_T )
         {
-            wxCHECK_MSG( aItem->GetLayerSet().Contains( aLayer ), violations,
+            LSET layers = aItem->GetLayerSet();
+
+            if( layers.Contains( F_Cu ) )
+                layers |= LSET::FrontBoardTechMask().set( F_CrtYd );
+
+            if( layers.Contains( B_Cu ) )
+                layers |= LSET::BackBoardTechMask().set( B_CrtYd );
+
+            if( layers.Contains( F_Cu ) && layers.Contains( B_Cu ) )
+                layers |= LSET::AllCuMask();
+
+            wxCHECK_MSG( layers.Contains( aLayer ), violations,
                     wxT( "Bug!  Vias should only be checked for layers on which they exist" ) );
 
             itemHoleShape = aItem->GetEffectiveHoleShape();
@@ -659,7 +670,18 @@ int DRC_TEST_PROVIDER_PHYSICAL_CLEARANCE::testItemAgainstItem( BOARD_ITEM* aItem
 
         if( other->Type() == PCB_VIA_T )
         {
-            wxCHECK_MSG( other->GetLayerSet().Contains( aLayer ), violations,
+            LSET layers = other->GetLayerSet();
+
+            if( layers.Contains( F_Cu ) )
+                layers |= LSET::FrontBoardTechMask().set( F_CrtYd );
+
+            if( layers.Contains( B_Cu ) )
+                layers |= LSET::BackBoardTechMask().set( B_CrtYd );
+
+            if( layers.Contains( F_Cu ) && layers.Contains( B_Cu ) )
+                layers |= LSET::AllCuMask();
+
+            wxCHECK_MSG( layers.Contains( aLayer ), violations,
                     wxT( "Bug!  Vias should only be checked for layers on which they exist" ) );
 
             otherHoleShape = other->GetEffectiveHoleShape();