use g_strcmp0() instead of strcmp() to guard against corrupt settings in the config file

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14011 f4695dd4-2c0a-0410-b89c-da849a56a58e
(libT) #5291 'increase scrape buffer sizes to accomodate for multiscrape': done with patch by reardon

git-svn-id: svn://svn.transmissionbt.com/Transmission/trunk@14012 f4695dd4-2c0a-0410-b89c-da849a56a58e