improve clean target
tree861c3af66adaec24d37df9f36a432e5cfad36b1f
-rw-r--r-- 1816 .defconfig
-rw-r--r-- 190 .gitignore
-rw-r--r-- 6304 Config.in
-rw-r--r-- 15254 Makefile
-rw-r--r-- 432 TODO
drwxr-xr-x - docs
drwxr-xr-x - package
drwxr-xr-x - project
drwxr-xr-x - target
drwxr-xr-x - toolchain