Revert "64 bit code generation in Mono."
Revert "64 bit code generation in Mono."

This reverts commit 3459ac35cd5ef2e2f133e05b74080a48a403ee67.

UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples,UCL-RITS/pi_examples