take sys_rt_sigsuspend() prototype to linux/syscalls.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 02b0450..66d298f 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -385,6 +385,8 @@
 asmlinkage long sys_sigsuspend(int unused1, int unused2, old_sigset_t mask);
 #endif
 
+asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize);
+
 #ifdef CONFIG_OLD_SIGACTION
 asmlinkage long sys_sigaction(int, const struct old_sigaction __user *,
 				struct old_sigaction __user *);