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

libc/Makefile

@@ -298,6 +298,8 @@ sys/uio/preadv.o \
 sys/uio/pwritev.o \
 sys/uio/readv.o \
 sys/uio/writev.o \
+sys/wait/wait.o \
+sys/wait/waitpid.o \
 termios/tcgetwinsize.o \
 time/clock_getres.o \
 time/clock_gettime.o \
@@ -398,8 +400,6 @@ unistd/usleep.o \
 unistd/write.o \
 utime.o \
 vscanf.o \
-wait.o \
-waitpid.o \
 
 OBJS=\
 $(FREEOBJS) \

libc/sys/wait/wait.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/>.
 
-    wait.cpp
+    sys/wait/wait.cpp
     Wait for child process.
 
 *******************************************************************************/

libc/sys/wait/waitpid.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/>.
 
-    waitpid.cpp
+    sys/wait/waitpid.cpp
     Wait for child process.
 
 *******************************************************************************/