pstree: Define RLIM_NLIMITS

On PI machine we've got

 |   CC	   protobuf.o
 | pstree.c: In function ‘core_entry_alloc’:
 | pstree.c:36:10: error: ‘RLIM_NLIMITS’ undeclared (first use in this function)

due to old kernel headers. Note I've dropped off
BUG_ON here to localize all things in pstree code,
no need to sprinkle constants.
Reported-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -321,8 +321,6 @@ static int dump_task_rlimits(int pid, TaskRlimitsEntry *rls)
 {
 	int res;
 
-	BUG_ON(rls->n_rlimits < RLIM_NLIMITS);
-
 	for (res = 0; res <rls->n_rlimits ; res++) {
 		struct rlimit lim;
 

pstree.c

@@ -22,6 +22,10 @@ void core_entry_free(CoreEntry *core)
 	xfree(core);
 }
 
+#ifndef RLIM_NLIMITS
+# define RLIM_NLIMITS 16
+#endif
+
 CoreEntry *core_entry_alloc(int th, int tsk)
 {
 	size_t sz;