sudo: bump version, use official upstream, don't disable auth

sudo without authentication doesn't make much sense, and it has very
limited impact on binary size.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/sudo/Config.in

@@ -5,3 +5,5 @@ config BR2_PACKAGE_SUDO
 	  limited root privileges to users and log root activity.  The
 	  basic philosophy is to give as few privileges as possible
 	  but still allow people to get their work done.
+
+	  http://www.sudo.ws/sudo/

package/sudo/sudo.mk

@@ -4,9 +4,8 @@
 #
 #############################################################
 
-SUDO_VERSION = 1.7.4p6
-SUDO_SITE    = $(BR2_DEBIAN_MIRROR)/debian/pool/main/s/sudo
-SUDO_SOURCE  = sudo_$(SUDO_VERSION).orig.tar.gz
+SUDO_VERSION = 1.7.6p2
+SUDO_SITE    = http://www.sudo.ws/sudo/dist
 
 SUDO_CONF_OPT = \
 		--without-lecture \
@@ -14,7 +13,6 @@ SUDO_CONF_OPT = \
 		--without-umask \
 		--with-logging=syslog \
 		--without-interfaces \
-		--disable-authentication \
 		--without-pam
 
 define SUDO_INSTALL_TARGET_CMDS