[sysctl] Fix breakage on systems with older glibc

As predicted during code review, the sysctl(2) changes made systems with
old glibc nearly unusable.  About every command gives a:

  warning: process `ls' used the deprecated sysctl system call with 1.4

warning in the log.

I see this on a SUSE 10.0 system with glibc 2.3.5.

Don't warn for this common case.
Signed-off-by: NAndi Kleen <ak@linux.intel.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

kernel/sysctl_binary.c

@@ -1399,6 +1399,13 @@ static void deprecated_sysctl_warning(const int *name, int nlen)
 {
 	int i;
 
+	/*
+	 * CTL_KERN/KERN_VERSION is used by older glibc and cannot
+	 * ever go away.
+	 */
+	if (name[0] == CTL_KERN && name[1] == KERN_VERSION)
+		return;
+
 	if (printk_ratelimit()) {
 		printk(KERN_INFO
 			"warning: process `%s' used the deprecated sysctl "