Revert "[PATCH] make kernel/signal.c:kill_proc_info() static"

This reverts commit d3228a887cae75ef2b8b1211c31c539bef5a5698.
DeBunk this code.  We need it for compat_sys_rt_sigqueueinfo.

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 4463735..c904581 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1329,6 +1329,7 @@
 extern int kill_pid(struct pid *pid, int sig, int priv);
 extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
 extern int kill_pg_info(int, struct siginfo *, pid_t);
+extern int kill_proc_info(int, struct siginfo *, pid_t);
 extern void do_notify_parent(struct task_struct *, int);
 extern void force_sig(int, struct task_struct *);
 extern void force_sig_specific(int, struct task_struct *);