vm: Fix DEBUG flag, make REPRODUCIBLE work like debug, minor fixes to build.sh

vm: Fix DEBUG flag, make REPRODUCIBLE work like debug, minor fixes to build.sh

- ``make DEBUG=0`` caused debug mode because the check was ``ifdef DEBUG`` which is true even if DEBUG=0
- no need to ``#pragma message`` that we are doing a reproducible build imo
- clang warns about redefining builtin macros, turn the warning off for reproducible builds
- add ``./build.sh info`` as an alias for ``./build.sh report``
- show if we a reproducible in report/info