utils/lxc: disable gnutls during configure

Previous versions of LXC never compiled in gnutls support due to a bug in the
configure script. As other TLS implementations are not supported and the feature
was disabled in previous builds, disable it during configure.

See https://github.com/lxc/lxc/pull/1360 for details regarding the bug in the
autoconf of the previous versions.

Signed-off-by: Karl Vogel <karl.vogel@gmail.com>

utils/lxc/Makefile

@@ -124,6 +124,7 @@ define Package/lxc-init
 endef
 
 CONFIGURE_ARGS += \
+	--disable-gnutls \
 	--disable-apparmor \
 	--disable-doc \
 	--disable-examples \