[1.1.x][PlatformIO] Stop compiling after first five errors (#8828)

Marlin/configuration_store.cpp

@@ -781,7 +781,9 @@ void MarlinSettings::postprocess() {
     }
     else {
       float dummy = 0;
-      bool dummyb;
+      #if DISABLED(AUTO_BED_LEVELING_UBL) || DISABLED(FWRETRACT)
+        bool dummyb;
+      #endif
 
       working_crc = 0;  // Init to 0. Accumulated by EEPROM_READ