Source of libjpeg-turbo

[[libjpeg]]

- http://libjpeg-turbo.virtualgl.org/


* . [#b49aa9bc]

- SIMD DCT/IDCT in libjpeg-turbo and bit-exactness
--  http://ssvb.github.io/2011/08/22/simd-idct-libjpeg-turbo-bitexactness.html