dumpscan: Include time.h

Various parts of dumpscan use ctime(), time(), etc, but don't include
time.h. This causes errors on AIX when using the clang-based xlc 17.1,
such as:

    .../src/tools/dumpscan/parsevol.c:286:35: error: call to undeclared function 'ctime'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
                printf("%s%s", field->label, ctime(&when));
                                             ^

Include time.h in these files, so we have declarations for these
functions.

Change-Id: I0247a55952640585ff3b27d2b0e47e09dea531a0
Reviewed-on: https://gerrit.openafs.org/15435
Reviewed-by: Ben Huntsman <ben@huntsmans.net>
Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>

src/tools/dumpscan/backuphdr.c

@@ -29,6 +29,7 @@
 /* backuphdr.c - Parse and print backup system headers */
 
 #include <stdlib.h>
+#include <time.h>
 
 #include "dumpscan.h"
 #include "dumpscan_errs.h"

src/tools/dumpscan/dump.c

@@ -28,6 +28,8 @@
 
 /* dump.c - Write out parts of a volume dump */
 
+#include <time.h>
+
 #include "dumpscan.h"
 #include "dumpfmt.h"
 

src/tools/dumpscan/dumptool.c

@@ -76,6 +76,7 @@
 #include <fnmatch.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
+#include <time.h>
 
 #include <rx/rx_queue.h>
 #include <lock.h>

src/tools/dumpscan/parsevnode.c

@@ -31,6 +31,7 @@
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <errno.h>
+#include <time.h>
 
 #include "dumpscan.h"
 #include "dumpscan_errs.h"

src/tools/dumpscan/parsevol.c

@@ -28,6 +28,8 @@
 
 /* parsevol.c - Parse a volume header */
 
+#include <time.h>
+
 #include "dumpscan.h"
 #include "dumpscan_errs.h"
 #include "dumpfmt.h"

src/tools/dumpscan/repair.c

@@ -33,6 +33,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
+#include <time.h>
 
 #include "dumpscan.h"
 #include "dumpscan_errs.h"