Use C++ specific include statements.

Author: meisterT

judge/runguard.cc

@@ -41,23 +41,23 @@
 #include <sys/times.h>
 #include <sys/resource.h>
 #include <sys/types.h>
-#include <errno.h>
+#include <cerrno>
 #include <fcntl.h>
-#include <signal.h>
-#include <stdlib.h>
+#include <csignal>
+#include <cstdlib>
 #include <unistd.h>
-#include <string.h>
-#include <stdarg.h>
-#include <stdio.h>
+#include <cstring>
+#include <cstdarg>
+#include <cstdio>
 #include <getopt.h>
 #include <fnmatch.h>
 #include <regex.h>
 #include <pwd.h>
 #include <grp.h>
-#include <time.h>
-#include <math.h>
-#include <limits.h>
-#include <inttypes.h>
+#include <ctime>
+#include <cmath>
+#include <climits>
+#include <cinttypes>
 #include <libcgroup.h>
 #include <sched.h>
 #include <sys/sysinfo.h>