Added sys_close() but its not done yet.

close() needs to flush dirty buffers.
pager needs to have read/write support properly implemented.
open() needs to record mode and access times.
The need for access times means we need rtc and time implementation.
Also need to add stat() access() etc.

tasks/fs0/include/path.h

@@ -23,7 +23,6 @@
 struct pathdata {
 	struct list_head list;
 	struct vnode *vstart;
-	int root;
 };
 
 struct pathcomp {