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

libc/Makefile

@@ -197,7 +197,6 @@ fsmarshall/fsm_send.o \
 getc.o \
 grp/grent.o \
 init.o \
-ioctl.o \
 libgen/basename.o \
 libgen/dirname.o \
 locale/localeconv.o \
@@ -257,6 +256,7 @@ stdlib/rand.o \
 stdlib/realpath.o \
 stdlib/system.o \
 sys/display/dispmsg_issue.o \
+sys/ioctl/ioctl.o \
 sys/kernelinfo/kernelinfo.o \
 sys/select/select.o \
 sys/socket/accept4.o \

libc/sys/ioctl/ioctl.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/>.
 
-    ioctl.cpp
+    sys/ioctl/ioctl.cpp
     Miscellaneous device control interface.
 
 *******************************************************************************/