Fix lambda expression cannot be used in the mpu.exe's target source code in Mono.
Fix lambda expression cannot be used in the mpu.exe's target source code in Mono.

This commit adds complier options to resolve it.

undeadlabs/msgpack-cli,msgpack/msgpack-cli,scopely/msgpack-cli,undeadlabs/msgpack-cli,modulexcite/msgpack-cli,modulexcite/msgpack-cli,msgpack/msgpack-cli,scopely/msgpack-cli