Drop wrong default.upstream

pkgs/tools/typesetting/pdf2djvu/default.upstream

@@ -1,10 +0,0 @@
-url http://code.google.com/p/pdf2djvu/downloads/list
-version_link '[.]tar[.][a-z0-9]+$'
-process 'code[.]google[.]com//' ''
-version '.*_([0-9.]+[0-9]).*' '\1'
-
-do_overwrite () {
-  ensure_hash
-  set_var_value version "$CURRENT_VERSION"
-  set_var_value sha256 "$CURRENT_HASH"
-}