Ignore list updated: added os/ext/fatfs and os/ext/lwip.


git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7470 35acf78f-673a-0410-8e92-d51de3d6d3f4
Ignore porperty for fatfs and lwip moved to os/ext directory.


git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7471 35acf78f-673a-0410-8e92-d51de3d6d3f4