MFH: r541224 r547569
Upgrade to v1.38.1.
Release notes at https://github.com/libuv/libuv/releases/tag/v1.38.1.
devel/libuv: Update 1.38.1 -> 1.39.0
Release notes at https://github.com/libuv/libuv/releases/tag/v1.39.0.
While here, take maintainership after an offer by thierry@, since this
is an important dependency for the Node.js ports.
Approved by: thierry (maintainer)
Sponsored by: Miles AS
Approved by: ports-secteam (fluffy)