sws_utils: don't recursively include libswscale header

Add libswscale includes where they are actually needed instead.

sub/draw_bmp.c

@@ -22,6 +22,7 @@
 #include <math.h>
 #include <inttypes.h>
 
+#include <libswscale/swscale.h>
 #include <libavutil/common.h>
 
 #include "core/mp_common.h"

video/filter/vf_scale.c

@@ -22,6 +22,8 @@
 #include <inttypes.h>
 #include <sys/types.h>
 
+#include <libswscale/swscale.h>
+
 #include "config.h"
 #include "core/mp_msg.h"
 #include "core/options.h"

video/out/vo_x11.c

@@ -21,6 +21,7 @@
 #include <string.h>
 #include <sys/types.h>
 
+#include <libswscale/swscale.h>
 #include <libavutil/common.h>
 
 #include "config.h"

video/sws_utils.c

@@ -18,6 +18,7 @@
 
 #include <assert.h>
 
+#include <libswscale/swscale.h>
 #include <libavutil/opt.h>
 
 #include "sws_utils.h"

video/sws_utils.h

@@ -2,7 +2,6 @@
 #define MPLAYER_SWS_UTILS_H
 
 #include <stdbool.h>
-#include <libswscale/swscale.h>
 
 #include "mp_image.h"