Linux: fix up use_system_{libxml,libxslt,sqlite3}

http://codereview.chromium.org/164450


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@23324 0039d316-1c4b-4281-b951-d872f2087c98
8 files changed