Revert "Bug 33845: Disable Namecoin on nightly temporarily"

This reverts commit 4b9ad6d7.

rbm.conf

@@ -299,8 +299,7 @@ targets:
       # channels for now.
       snowflake: '[% c("var/alpha") || c("var/nightly") %]'
       # Only build Namecoin for linux on nightly
-      # Namecoin is temporarily disabled on nightly until #33845 is fixed.
-      namecoin: 0
+      namecoin: '[% c("var/nightly") %]'
       container:
         suite: wheezy
         arch: amd64