Update Makefile

Makefile

@@ -1,5 +1,5 @@
 CXX = g++
-CXXFLAGS = -Wall -O3 -g
+CXXFLAGS = -Wall -O3
 SFMLFLAGS = -lsfml-system -lsfml-window -lsfml-graphics
 
 # In case you installed SFML to a non-standard path, you'll need to tell the compiler where to find the SFML headers (.hpp files):
@@ -20,5 +20,5 @@ main.o: main.cpp
 
 Display.o: Display.h
 
-clean :
-	-rm *.o quickhull performance
+clean:
+	-rm *.o quickhull