Fewer warnings

Marlin/src/HAL/LPC1768/inc/Conditionals_post.h

 // LPC1768 boards seem to lose steps when saving to EEPROM during print (issue #20785)
 // TODO: Which other boards are incompatible?
 #if defined(MCU_LPC1768) && PRINTCOUNTER_SAVE_INTERVAL > 0
-  #warning "To prevent step loss, motion will pause for PRINTCOUNTER auto-save."
   #define PRINTCOUNTER_SYNC 1
 #endif

Marlin/src/module/printcounter.cpp

 
 #if PRINTCOUNTER_SYNC
   #include "../module/planner.h"
+  #warning "To prevent step loss, motion will pause for PRINTCOUNTER auto-save."
 #endif
 
 // Service intervals