bootstrap: make Buffer and process non-enumerable
This makes sure these two properties are non-enumerable. This aligns them with all other globals that are not enumerable by spec.
Refs: https://github.com/nodejs/node/issues/20565
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines