util: Handle null prototype on inspect
Fixes : https://github.com/nodejs/node/issues/22141
The implementation and texts are taken from the discussion over here: https://github.com/nodejs/node/issues/22141#issuecomment-412572287, https://github.com/nodejs/node/issues/22141#issuecomment-412576559
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines