Fix Windows build, hopefully fix High DPI support on Windows 10 (fixes #202)

Makefile

@@ -102,7 +102,7 @@ GL_LDFLAGS := $(shell $(PKG_CONFIG) --libs gl || echo -lGL)
 endif
 ifeq ($(PLATFORM),windows32)
 CFLAGS += -IWindows -Drandom=rand
-LDFLAGS += -lmsvcrt -lcomdlg32 -lSDL2main -Wl,/MANIFESTFILE:NUL
+LDFLAGS += -lmsvcrt -lcomdlg32 -luser32 -lSDL2main -Wl,/MANIFESTFILE:NUL
 SDL_LDFLAGS := -lSDL2
 GL_LDFLAGS := -lopengl32
 else
@@ -291,11 +291,11 @@ endif
 # Windows version builds two, one with a conole and one without it
 $(BIN)/SDL/sameboy.exe: $(CORE_OBJECTS) $(SDL_OBJECTS) $(OBJ)/Windows/resources.o
 	-@$(MKDIR) -p $(dir $@)
-	$(CC) $^ -o $@ $(LDFLAGS) $(SDL_LDFLAGS) -Wl,/subsystem:windows
+	$(CC) $^ -o $@ $(LDFLAGS) $(SDL_LDFLAGS) $(GL_LDFLAGS) -Wl,/subsystem:windows
 
 $(BIN)/SDL/sameboy_debugger.exe: $(CORE_OBJECTS) $(SDL_OBJECTS) $(OBJ)/Windows/resources.o
 	-@$(MKDIR) -p $(dir $@)
-	$(CC) $^ -o $@ $(LDFLAGS) $(SDL_LDFLAGS) -Wl,/subsystem:console
+	$(CC) $^ -o $@ $(LDFLAGS) $(SDL_LDFLAGS) $(GL_LDFLAGS) -Wl,/subsystem:console
 
 ifneq ($(USE_WINDRES),)
 $(OBJ)/%.o: %.rc

SDL/main.c

@@ -10,6 +10,7 @@
 
 
 #ifndef _WIN32
+#include <Windows.h>
 #define AUDIO_FREQUENCY 96000
 #else
 /* Windows (well, at least my VM) can't handle 96KHz sound well :( */
@@ -551,6 +552,9 @@ static bool get_arg_flag(const char *flag, int *argc, char **argv)
 
 int main(int argc, char **argv)
 {
+#ifdef _WIN32
+	SetProcessDPIAware();
+#endif
 #define str(x) #x
 #define xstr(x) str(x)
     fprintf(stderr, "SameBoy v" xstr(VERSION) "\n");