linux: split xdg_mime into a separate target
linux: split xdg_mime into a separate target

This will allow for building it with different flags.

BUG=34160

Review URL: http://codereview.chromium.org/561032

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@37933 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