Make the pix_fmts var in query_formats() static const.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20343 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavfilter/vf_crop.c

@@ -37,7 +37,7 @@ typedef struct {
 
 static int query_formats(AVFilterContext *ctx)
 {
-    enum PixelFormat pix_fmts[] = {
+    static const enum PixelFormat pix_fmts[] = {
         PIX_FMT_RGB48BE,      PIX_FMT_RGB48LE,
         PIX_FMT_ARGB,         PIX_FMT_RGBA,
         PIX_FMT_ABGR,         PIX_FMT_BGRA,