update neon config in libjpeg turbo 

This patch upgrades the neon config for libjpeg_turbo: use arm_version instead
of armv7, and respect arm_neon_optional. 

BUG=234135
Review URL: https://codereview.chromium.org/95883002/
Patch from Mostyn Bramley-Moore <mostynb@opera.com>!



git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libjpeg_turbo@238478 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed