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Reorder the Dav1dFrameHeader struct to fix alignment issues

The ar_coeff_shift element needs to have a 16-byte alignment on x86.

--- a/include/dav1d/headers.h

+++ b/include/dav1d/headers.h

@@ -329,13 +329,13 @@

 } Dav1dFilmGrainData;

 typedef struct Dav1dFrameHeader {

-    enum Dav1dFrameType frame_type; ///< type of the picture

-    int width[2 /* { coded_width, superresolution_upscaled_width } */], height;

-    int frame_offset; ///< frame number

     struct {

-        int present, update;

         Dav1dFilmGrainData data;

+        int present, update;

     } film_grain; ///< film grain parameters

+    enum Dav1dFrameType frame_type; ///< type of the picture

+    int width[2 /* { coded_width, superresolution_upscaled_width } */], height;

+    int frame_offset; ///< frame number

     int temporal_id, spatial_id; ///< spatial and temporal id of the frame for SVC

     int show_existing_frame;