message: imgcodecs(jpeg): drop unnecessary code
  standard huffman tables are handled by modern libjpeg-turbo
diff: @@ -75,6 +75,17 @@ extern "C" {
  #include "jpeglib.h"
  }
  +#ifndef CV_MANUAL_JPEG_STD_HUFF_TABLES
  + #if defined(LIBJPEG_TURBO_VERSION_NUMBER) && LIBJPEG_TURBO_VERSION_NUMBER >= 1003090
  + #define CV_MANUAL_JPEG_STD_HUFF_TABLES 0 // libjpeg-turbo handles standard huffman tables itself (jstdhuff.c)
  + #else
  + #define CV_MANUAL_JPEG_STD_HUFF_TABLES 1
  + #endif
  +#endif
  +#if CV_MANUAL_JPEG_STD_HUFF_TABLES == 0
  + #undef CV_MANUAL_JPEG_STD_HUFF_TABLES
  +#endif
  +
  namespace cv
  {
  @@ -252,6 +263,7 @@ bool JpegDecoder::readHeader()
  return result;
  }
  +#ifdef CV_MANUAL_JPEG_STD_HUFF_TABLES
  /***************************************************************************
  * following code is for supporting MJPEG image files
  * based on a message of Laurent Pinchart on the video4linux mailing list
  @@ -385,6 +397,7 @@ int my_jpeg_load_dht (struct jpeg_decompress_struct *info, unsigned char *dht,
  * end of code for supportting MJPEG image files
  * based on a message of Laurent Pinchart on the video4linux mailing list
  ***************************************************************************/
  +#endif // CV_MANUAL_JPEG_STD_HUFF_TABLES
  bool JpegDecoder::readData( Mat& img )
  {
  @@ -400,6 +413,7 @@ bool JpegDecoder::readData( Mat& img )
  if( setjmp( jerr->setjmp_buffer ) == 0 )
  {
  +#ifdef CV_MANUAL_JPEG_STD_HUFF_TABLES
  /* check if this is a mjpeg image format */
  if ( cinfo->ac_huff_tbl_ptrs[0] == NULL &&
  cinfo->ac_huff_tbl_ptrs[1] == NULL &&
  @@ -413,6 +427,7 @@ bool JpegDecoder::readData( Mat& img )
  cinfo->ac_huff_tbl_ptrs,
  cinfo->dc_huff_tbl_ptrs );
  }
  +#endif
  if( color )
  {
  