Remove runner

Makefile

@@ -15,7 +15,8 @@ run:
     	-semihosting
 
 clean:
-	rm -rf *.o *.a *.elf
+	rm -rf *.o *.a *.elf *.bin
+	rm -rf runner
 
 proper: clean
 	cd runtime_mps2 && cmake --build --preset an386 --target clean