delted contrib directory

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/contrib_test@7369 35acf78f-673a-0410-8e92-d51de3d6d3f4
Fixed external link to contrib repo

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/contrib_test@7370 35acf78f-673a-0410-8e92-d51de3d6d3f4
Fixed external link to contrib repo #2

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/branches/contrib_test@7371 35acf78f-673a-0410-8e92-d51de3d6d3f4