require RELEAEE_BUILD to be 1, not any value

Build/Version.hs

@@ -20,7 +20,7 @@ type Version = String
 {- Set when making an official release. (Distribution vendors should set
  - this too.) -}
 isReleaseBuild :: IO Bool
-isReleaseBuild = isJust <$> catchMaybeIO (getEnv "RELEASE_BUILD")
+isReleaseBuild = (== Just "1") <$> catchMaybeIO (getEnv "RELEASE_BUILD")
 
 {- Version is usually based on the major version from the changelog, 
  - plus the date of the last commit, plus the git rev of that commit.