Move sys/readdirents.h functions into their own directory.

libc/Makefile

@@ -229,7 +229,6 @@ popen.o \
 print.o \
 putc.o \
 pwd/pwent.o \
-readdirents.o \
 removeat.o \
 remove.o \
 renameat.o \
@@ -258,6 +257,7 @@ stdlib/system.o \
 sys/display/dispmsg_issue.o \
 sys/ioctl/ioctl.o \
 sys/kernelinfo/kernelinfo.o \
+sys/readdirents/readdirents.o \
 sys/select/select.o \
 sys/socket/accept4.o \
 sys/socket/accept.o \

libc/sys/readdirents/readdirents.cpp

@@ -17,7 +17,7 @@
     You should have received a copy of the GNU Lesser General Public License
     along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
 
-    readdirents.cpp
+    sys/readdirents/readdirents.cpp
     Reads entries from a directory file descriptor.
 
 *******************************************************************************/