Fix build error from 5803

eeschema/project_rescue.cpp

@@ -487,10 +487,6 @@ void RESCUER::UndoRescues()
 
 bool SCH_EDIT_FRAME::RescueProject( bool aRunningOnDemand )
 {
-    // Data that will be used throughout the operation
-    std::vector<RESCUE_CANDIDATE>   candidates;
-    wxString                part_name_suffix;
-
     RESCUER rescuer( *this, Prj() );
 
     rescuer.FindCandidates();

eeschema/project_rescue.h

@@ -56,6 +56,8 @@ enum RESCUE_TYPE
 class RESCUE_CANDIDATE
 {
 public:
+    virtual ~RESCUE_CANDIDATE() {}
+
     /**
      * Function GetRequestedName
      * Get the name that was originally requested in the schematic