Added t2151 - order-only pre-requisites for lua.
Fixed an issue with ENV not being loaded into upvalues, incorrect ENV upvalue index used for append_assignment.
Fixes state pollution in tup.include'd tupfiles, was preventing error handling.
Adds null character to empty input string.
Stop compiling builtins before embedding.  Apparently the bytecode isn't portable, which is an issue for MinGW builds in some situations.
Use the correct stack to prevent concurrent stack modification when recursively loading files.
parser: Display node creation errors to tf->f