Hello,
Build works for default arduino_zero board, but it doest not work anymore for feather_m0_basic

In file included from access_vfs.h:33:0,
from access_vfs.c:29:
asf/common/services/storage/ctrl_access/ctrl_access.h:142:25: fatal error: rom_fs.h: No such file or directory
#include LUN_0_INCLUDE
^
compilation terminated.
../py/mkrules.mk:47: recipe for target 'build-feather_m0_basic/access_vfs.o' failed

I tried to get arround with a symbolic link between access_vfs.h and rom_fs.h but I get more error messages.

(This seems linked to PR 31 #31)