Revert of Switch SkJpegCode to libjpeg-turbo

Revert of Switch SkJpegCode to libjpeg-turbo (patchset #28 id:710001 of https://codereview.chromium.org/1180983002/)

Reason for revert:
Broke iOS build.

Original issue's description:
> Add libjpeg-turbo library (depends on yasm)
> Mangle external function names to avoid conflict with libjpeg
> Take advantage of direct color conversion (RGBA, BGRA, 565)
> Prepare to use jpeg_skip_scanlines (when it is upstreamed)
> 
> BUG=skia:
> 
> Committed: https://skia.googlesource.com/skia/+/b60c3f8291529303299262dba19b1a896060bd2d
> 
> Committed: https://skia.googlesource.com/skia/+/f8bf9181d7b0463c8e371755cfbb9ece90b34fc5
> 
> Committed: https://skia.googlesource.com/skia/+/e9e3ee33f30c14c31afd5fc3fe4dda7f15783c75

TBR=scroggo@google.com,djsollen@google.com,emmaleer@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Committed: https://skia.googlesource.com/skia/+/aa2a7de0ffaf8f864a7afc68bbd34ccb25876246

[msarett, 2015-07-01 20:10:43]

Created Revert of Switch SkJpegCode to libjpeg-turbo

[commit-bot: I haz the power, 2015-07-01 20:10:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1213093003/1

[commit-bot: I haz the power, 2015-07-01 20:11:12]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/aa2a7de0ffaf8f864a7afc68bbd34ccb25876246