Detected on NetBSD/amd64.

Fixes: nodejs#29536

PR-URL: nodejs#29541
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

Move the generated previous doc versions JSON file out of `out/doc` to
prevent it being included in the distributed packages.

Signed-off-by: Richard Lau <riclau@uk.ibm.com>

PR-URL: nodejs#32728
Fixes: nodejs/build#2276
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

Add floating patch for ICU 64.2 from unicode-org/icu@18b212f.

Original commit message:
    ICU-21032 Backport to 64.x: ICU-20958 Prevent SEGV_MAPERR in append

    See nodejs#971

    (cherry picked from commit b7d08bc04a4296982fcef8b6b8a354a9e4e7afca)

Refs: https://unicode-org.atlassian.net/browse/ICU-20958
Refs: unicode-org/icu#1155