Fix asset bundling to work on Windows

makefile

@@ -1,19 +1,42 @@
 CC?=gcc
+LD?=ld
 SHROOMSFLAGS=shrooms-vb-core/core/vb.c -I shrooms-vb-core/core
-SDL2FLAGS=$(shell pkg-config sdl2 --cflags --libs)
+SDL2FLAGS=$(shell pkg-config sdl2 --cflags --libs) -mconsole
 
-.PHONY: clean
+.PHONY: clean build
 clean:
-ifeq ($(OS),WINDOWS_NT)
-	@del shrooms-vb.exe
-else
-	@rm -f shrooms-vb
-endif
+	@rm -rf shrooms-vb output
 
-build:
-	@$(CC) audio.c cli.c controller.c game.c graphics.c main.c assets/assets.s -I . \
-		$(SHROOMSFLAGS) $(SDL2FLAGS) \
-		-D POSIX_C_SOURCE=199309L \
-		-o shrooms-vb \
-		-O3 -fno-strict-aliasing \
-		-Werror -std=c90 -Wall -Wextra -Wpedantic
+CFILES := $(foreach dir,./,$(notdir $(wildcard $(dir)/*.c)))
+BINFILES := $(foreach dir,assets/,$(notdir $(wildcard $(dir)/*.bin)))
+
+COBJS := $(CFILES:%.c=output/%.o)
+SHROOMSOBJS := output/vb.o
+BINOBJS := $(BINFILES:%.bin=output/%.o)
+
+OFILES := $(COBJS) $(SHROOMSOBJS) $(BINOBJS)
+
+output/%.o: %.c
+	@mkdir -p output
+	@$(CC) -c -o $@ $< -I . \
+		-I shrooms-vb-core/core $(SDL2FLAGS) \
+		-D _POSIX_C_SOURCE=199309L \
+		-O3 -flto -fno-strict-aliasing \
+		-Werror -std=c11 -Wall -Wextra -Wpedantic
+
+output/vb.o: shrooms-vb-core/core/vb.c
+	@mkdir -p output
+	@$(CC) -c -o $@ $< -I . \
+		-I shrooms-vb-core/core $(SDL2FLAGS) \
+		-D _POSIX_C_SOURCE=199309L \
+		-O3 -flto -fno-strict-aliasing \
+		-Werror -std=c11 -Wall -Wextra -Wpedantic
+
+output/%.o: assets/%.bin
+	@mkdir -p output
+	@$(LD) -r -b binary -o $@ $<
+
+shrooms-vb: $(OFILES)
+	@$(CC) -o $@ $(OFILES) $(SDL2FLAGS) -flto
+
+build: shrooms-vb