Fix sdl_zoom compile problems on OpenBSD

Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

Makefile

@@ -187,7 +187,7 @@ sdl_zoom.o: sdl_zoom.c sdl_zoom.h sdl_zoom_template.h
 
 sdl.o: sdl.c keymaps.h sdl_keysym.h sdl_zoom.h
 
-sdl.o audio/sdlaudio.o baum.o: CFLAGS += $(SDL_CFLAGS)
+sdl.o audio/sdlaudio.o sdl_zoom.o baum.o: CFLAGS += $(SDL_CFLAGS)
 
 acl.o: acl.h acl.c
 

sdl_zoom.c

@@ -14,6 +14,7 @@
 #include "sdl_zoom.h"
 #include "osdep.h"
 #include <stdint.h>
+#include <stdio.h>
 
 static int sdl_zoom_rgb16(SDL_Surface *src, SDL_Surface *dst, int smooth,
                           SDL_Rect *dst_rect);