Remove outdated comment in h264dsp.h

Since we no longer have non-transposed scantables, the problem it warns about
no longer exists.

Originally committed as revision 26339 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264dsp.h

@@ -57,10 +57,6 @@ typedef struct H264DSPContext{
                                       int bidir, int edges, int step, int mask_mv0, int mask_mv1, int field);
 
     /* IDCT */
-    /* NOTE!!! if you implement any of h264_idct8_add, h264_idct8_add4 then you must implement all of them
-       NOTE!!! if you implement any of h264_idct_add, h264_idct_add16, h264_idct_add16intra, h264_idct_add8 then you must implement all of them
-        The reason for above, is that no 2 out of one list may use a different permutation.
-    */
     void (*h264_idct_add)(uint8_t *dst/*align 4*/, DCTELEM *block/*align 16*/, int stride);
     void (*h264_idct8_add)(uint8_t *dst/*align 8*/, DCTELEM *block/*align 16*/, int stride);
     void (*h264_idct_dc_add)(uint8_t *dst/*align 4*/, DCTELEM *block/*align 16*/, int stride);