doc: add builtin module in building.md
Add builtin module doc in BUILDING.md
and introduce --link-modules
in doc.
Fixes: https://github.com/nodejs/node/issues/12516 Refs: https://github.com/nodejs/node/pull/2497
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc