GerbView: incorrect handling of polygon primitive: broken parameters rotation and drill size.

Fixes: lp:1778459
https://bugs.launchpad.net/kicad/+bug/1778459

gerbview/dcode.cpp

@@ -407,12 +407,10 @@ void D_CODE::ConvertShapeToPolygon()
 
         addHoleToPolygon( &m_Polygon, m_DrillShape, m_Drill, initialpos );
 
-        if( m_Rotation )                   // vertical oval, rotate polygon.
+        if( m_Rotation )    // rotate polygonal shape:
         {
-            int angle = KiROUND( m_Rotation * 10 );
-
-            for( auto it = m_Polygon.Iterate( 0 ); it; ++it )
-                it->Rotate( -angle );
+            double angle = m_Rotation * M_PI / 180;
+            m_Polygon.Rotate( angle, VECTOR2I( 0, 0 ) );
         }
 
         break;

gerbview/rs274x.cpp

@@ -824,7 +824,7 @@ bool GERBER_FILE_IMAGE::ExecuteRS274XCommand( int aCommand, char* aBuff,
                 {
                     aText++;
                     dcode->m_Drill.x = KiROUND( ReadDouble( aText ) * conv_scale );
-                    dcode->m_Drill.y = dcode->m_Drill.x =
+                    dcode->m_Drill.y = dcode->m_Drill.x;
                     dcode->m_DrillShape = APT_DEF_ROUND_HOLE;
                 }