doc: mention python3-distutils dependency in BUILDING.md

Ran into #30189, solved by this comment:
https://github.com/nodejs/node/issues/30189#issuecomment-548250793

Refs: https://github.com/nodejs/node/issues/30189
PR-URL: https://github.com/nodejs/node/pull/33174
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Christian Clauss <cclauss@me.com>
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osher 2020-04-30 23:08:09 +03:00 committed by Anna Henningsen
parent d6b19fd537
commit d6913dc1f0
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@ -249,6 +249,8 @@ Installation via Linux package manager can be achieved with:
FreeBSD and OpenBSD users may also need to install `libexecinfo`.
Python 3 users may also need to install `python3-distutils`.
#### macOS prerequisites
* Xcode Command Line Tools >= 10 for macOS