Add targets for extensions/mpdt to openfst.BUILD.
Add targets for extensions/mpdt to openfst.BUILD.

googlei18n/language-resources,google/language-resources,google/language-resources,googlei18n/language-resources,google/language-resources,google/language-resources,googlei18n/language-resources,googlei18n/language-resources,google/language-resources,google/language-resources,googlei18n/language-resources,googlei18n/language-resources