Fix backup and kernel download url.

Remove duplicated slash from backup and kernel download url,
e.g. http://www.kernel.org/pub//linux/kernel/v3.x/linux-3.13.3.tar.xz

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Config.in

@@ -173,7 +173,7 @@ if !BR2_PRIMARY_SITE_ONLY
 
 config BR2_BACKUP_SITE
 	string "Backup download site"
-	default "http://sources.buildroot.net/"
+	default "http://sources.buildroot.net"
 	help
 	  Backup site to download from. If this option is set then buildroot
 	  will fall back to download package sources from here if the
@@ -181,7 +181,7 @@ config BR2_BACKUP_SITE
 
 config BR2_KERNEL_MIRROR
 	string "Kernel.org mirror"
-	default "http://www.kernel.org/pub/"
+	default "http://www.kernel.org/pub"
 	help
 	  kernel.org is mirrored on a number of servers around the world.
 	  The following allows you to select your preferred mirror.