Fix compile error on Linux.

include/class_board_item.h

@@ -72,6 +72,8 @@ static inline wxString STROKE_T_asString( STROKE_T a )
     case S_LAST:    return "S_LAST";    // Synthetic value, but if we come across it we're
                                         // going to want to know.
     }
+
+    return wxEmptyString;  // Just to quiet GCC.
 };
 
 

include/pad_shapes.h

@@ -52,6 +52,8 @@ static inline wxString PAD_SHAPE_T_asString( PAD_SHAPE_T a )
     case PAD_SHAPE_CHAMFERED_RECT: return "PAD_SHAPE_CHAMFERED_RECT";
     case PAD_SHAPE_CUSTOM:         return "PAD_SHAPE_CUSTOM";
     }
+
+    return wxEmptyString;  // Just to quiet GCC.
 };
 
 

libs/kimath/include/geometry/shape.h

@@ -61,6 +61,8 @@ static inline wxString SHAPE_TYPE_asString( SHAPE_TYPE a )
     case SH_COMPOUND:   return "SH_COMPOUND";
     case SH_ARC:        return "SH_ARC";
     }
+
+    return wxEmptyString;  // Just to quiet GCC.
 }