samba: security bump to version 3.6.20

Fixes CVE-2013-4475 and CVE-2013-4476.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/samba/samba.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SAMBA_VERSION = 3.6.19
+SAMBA_VERSION = 3.6.20
 SAMBA_SITE = http://ftp.samba.org/pub/samba/stable
 SAMBA_SUBDIR = source3
 SAMBA_INSTALL_STAGING = YES