HP/UX: Make more use of roken

Make more use of roken on HP/UX by letting it provide definitions
for random and srandom, and using its implementation of
getdtablesize

Change-Id: I1212c77ea9cc6ef436cfc5c16e893aefbc33d31b
Reviewed-on: http://gerrit.openafs.org/4341
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>

acinclude.m4

@@ -1250,6 +1250,7 @@ AC_CHECK_HEADERS([ \
 		   sys/statfs.h \
 		   sys/statvfs.h \
 		   sys/socket.h \
+		   sys/sysctl.h \
 		   sys/time.h \
 		   sys/types.h \
 		   sys/un.h \
@@ -1341,6 +1342,8 @@ AC_CHECK_FUNCS([ \
 	sigaction \
 	strcasestr \
 	strerror \
+	sysconf \
+	sysctl \
 	timegm \
 ])
 
@@ -1352,7 +1355,6 @@ dnl haven't found a need for yet, and so haven't imported
 AC_CHECK_FUNCS([ \
 	chown \
 	fchown \
-	getdtablesize \
 	gethostname \
 	gettimeofday \
 	localtime_r \
@@ -1385,6 +1387,7 @@ AC_REPLACE_FUNCS([ \
 	erealloc \
 	err \
 	errx \
+	getdtablesize \
 	getopt \
 	getprogname \
 	mkstemp \

src/util/hputil.c

@@ -29,24 +29,6 @@ utimes(char *file, struct timeval tvp[2])
 }
 #endif
 
-int
-random(void)
-{
-    return rand();
-}
-
-void
-srandom(int seed)
-{
-    srand(seed);
-}
-
-int
-getdtablesize(void)
-{
-    return (20);
-}
-
 void
 setlinebuf(FILE * file)
 {