Fix issue with disable_functions check


git-svn-id: https://plugins.svn.wordpress.org/cw-image-optimizer/trunk@1032720 b8457f37-d9ea-0310-8a92-e5e31aec5664
v1.1.10


git-svn-id: https://plugins.svn.wordpress.org/cw-image-optimizer/trunk@1032721 b8457f37-d9ea-0310-8a92-e5e31aec5664