Keep esp32 and esp8266 version specific tweaks separate.

compiler/options.pas

@@ -1320,11 +1320,16 @@ begin
         set_system_compvar('IDF_VERSION','30300');
         idf_version:=30300;
       end;
-    else
+    ct_esp32:
       begin
         set_system_compvar('IDF_VERSION','40200');
         idf_version:=40200;
       end;
+    else
+      begin
+        set_system_compvar('IDF_VERSION','00000');
+        idf_version:=0;
+      end;
   end;
 end;
 {$endif XTENSA}

compiler/pmodules.pas

@@ -415,7 +415,7 @@ implementation
 {$pop}
 {$ifdef XTENSA}
         if not(current_module.is_unit) and (target_info.system=system_xtensa_freertos) then
-          if idf_version>=40200 then
+          if (current_settings.controllertype=ct_esp32) and (idf_version>=40200) then
             AddUnit('espidf_40200');
 {$endif XTENSA}
       end;