Bug 1747981 - Port bug 1747855: Move --disable-updater to python configure. r=mkmelin

--HG--
extra : amend_source : 6cb7b757d927d14f11a810f237ff2fe8c4fac36f

mail/confvars.sh

@@ -4,7 +4,6 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 MOZ_APP_NAME=thunderbird
-MOZ_UPDATER=1
 
 if test "$OS_ARCH" = "WINNT"; then
   if ! test "$HAVE_64BIT_BUILD"; then