Update makefile

makefile

@@ -9,9 +9,11 @@ _test: _build
 	./test/test.exe
 
 rc:
+	if [ ! -d build ]; then mkdir build; fi
 	windres ascii.rc -o build/asciirc.o
 
 renderer:
+	if [ ! -d build ]; then mkdir build; fi
 	$(CXX) -shared -o build/renderer.dll src/renderer.cpp -Wno-write-strings
 
 _build: clean renderer rc
@@ -20,6 +22,7 @@ _build: clean renderer rc
 	$(CC) -o build/ascii.exe build/ascii.o src/main.c -Lbuild -lrenderer build/asciirc.o
 
 clean:
+	if [ ! -d build ]; then mkdir build; fi
 	rm -rf build/*.o
 	rm -rf build/*.exe
 	rm -rf build/*.dll