Fix test_drc_regressions.cpp: disable tests that need a footprint library

DRCE_LIB_FOOTPRINT_ISSUES and DRCE_LIB_FOOTPRINT_MISMATCH imply a library
but the test cases do not have a library.

common/font/outline_decomposer.cpp

@@ -223,7 +223,7 @@ int OUTLINE_DECOMPOSER::winding( const GLYPH_POINTS& aContour ) const
         return 0;
     }
 
-    unsigned int i_lowest_vertex;
+    unsigned int i_lowest_vertex = 0;
     double       lowest_y = std::numeric_limits<double>::max();
 
     for( unsigned int i = 0; i < aContour.size(); i++ )

pcbnew/drc/drc_test_provider_library_parity.cpp

@@ -499,7 +499,7 @@ bool DRC_TEST_PROVIDER_LIBRARY_PARITY::Run()
             drcItem->SetItems( footprint );
             reportViolation( drcItem, footprint->GetCenter(), UNDEFINED_LAYER );
         }
-        else if( libFootprint && footprint->FootprintNeedsUpdate( libFootprint.get() )
+        else if( footprint->FootprintNeedsUpdate( libFootprint.get() )
                     && !m_drcEngine->IsErrorLimitExceeded( DRCE_LIB_FOOTPRINT_MISMATCH ))
         {
             std::shared_ptr<DRC_ITEM> drcItem = DRC_ITEM::Create( DRCE_LIB_FOOTPRINT_MISMATCH );

qa/pcbnew/drc/test_drc_regressions.cpp

@@ -68,11 +68,13 @@ BOOST_FIXTURE_TEST_CASE( DRCFalsePositiveRegressions, DRC_REGRESSION_TEST_FIXTUR
         std::vector<DRC_ITEM>  violations;
         BOARD_DESIGN_SETTINGS& bds = m_board->GetDesignSettings();
 
-        // Disable DRC tests not useful in this testcase
+        // Disable DRC tests not useful or not handled in this testcase
         bds.m_DRCSeverities[ DRCE_INVALID_OUTLINE ] = SEVERITY::RPT_SEVERITY_IGNORE;
         bds.m_DRCSeverities[ DRCE_UNCONNECTED_ITEMS ] = SEVERITY::RPT_SEVERITY_IGNORE;
         bds.m_DRCSeverities[ DRCE_COPPER_SLIVER ] = SEVERITY::RPT_SEVERITY_IGNORE;
         bds.m_DRCSeverities[ DRCE_STARVED_THERMAL ] = SEVERITY::RPT_SEVERITY_IGNORE;
+        bds.m_DRCSeverities[ DRCE_LIB_FOOTPRINT_ISSUES ] = SEVERITY::RPT_SEVERITY_IGNORE;
+        bds.m_DRCSeverities[ DRCE_LIB_FOOTPRINT_MISMATCH ] = SEVERITY::RPT_SEVERITY_IGNORE;
 
         bds.m_DRCEngine->SetViolationHandler(
                 [&]( const std::shared_ptr<DRC_ITEM>& aItem, VECTOR2I aPos, PCB_LAYER_ID aLayer )