avcodec: Move STRIDE_ALIGN to internal.h

The next commit/bugfix will need it

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit da89572004)

libavcodec/internal.h

@@ -35,6 +35,12 @@
 
 #define FF_SANE_NB_CHANNELS 63U
 
+#if HAVE_NEON || ARCH_PPC || HAVE_MMX
+#   define STRIDE_ALIGN 16
+#else
+#   define STRIDE_ALIGN 8
+#endif
+
 typedef struct FramePool {
     /**
      * Pools for each data plane. For audio all the planes have the same size,

libavcodec/utils.c

@@ -274,12 +274,6 @@ int ff_side_data_update_matrix_encoding(AVFrame *frame,
     return 0;
 }
 
-#if HAVE_NEON || ARCH_PPC || HAVE_MMX
-#   define STRIDE_ALIGN 16
-#else
-#   define STRIDE_ALIGN 8
-#endif
-
 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
                                int linesize_align[AV_NUM_DATA_POINTERS])
 {