Don't run scons on every commit if MONGO_VERSION and MONGO_GIT_HASH are set correctly
Don't run scons on every commit if MONGO_VERSION and MONGO_GIT_HASH are set correctly

This also requires running on a new enough commit that errorcodes.py supports
the --list-files flag.

RedBeard0531/mongo_module_ninja,RedBeard0531/mongo_module_ninja,RedBeard0531/mongo_module_ninja