linux: add another path to plugin search path list
linux: add another path to plugin search path list

I've seen users reporting they need this on openSUSE and there's
a patch in the ALT Linux repo for it as well.

Review URL: http://codereview.chromium.org/524002

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@35304 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser