Fix warning about always_inline attribute in libjpeg_turbo.

GCC 4.7/4.8 warns when __attribute__((always_inline)) is used without a
normal 'inline' keyword. Pull an equivalent of upstream r1188 to avoid
this warning.

R=rmcilroy@chromium.org, phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/218733003

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libjpeg_turbo@261103 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
2 files changed