[FFmpeg-devel] Fix bug for POWER LE in file libswscale/ppc/yuv2rgb_altivec.c

[rongyan]

Hi,
 We propose this patch to fix the bug on POWER LE when converting yuv to rgb in macros vec_unh() and vec_unl() in file libswscale/ppc/yuv2rgb_altivec.c.
  
 Our test case is like this:
 ffmpeg -i input.mov -f rawvideo -pix_fmt rgb24 result.rgb
  
 Before fix the bug, the output rgb frame is as follows:
 
 After bug fix, the output rgb frame is:
 
  
 The fate test result with out patch is in the below:
 
 Thanks for your review.
  
 Rong Yan
  ------------------
  The world has enough for everyone's need, but not enough for everyone's greed.
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