Add PRIVATE flags to global symbols.
This change adds the 'private_extern' flags (on Mac) or the 'hidden' flags (on Linux) to the all global symbols in libjpeg-turbo as suggested in <http://codereview.chromium.org/6332003/>.

BUG=none
TEST=build Chromium on Mac without any changes to the 'framework.order' file.
Review URL: http://codereview.chromium.org/6246098

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libjpeg_turbo@73971 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
57 files changed