New port: devel/bazel

Bazel is Google's own build tool, now publicly available in Beta.
Bazel has built-in support for building both client and server
software, including client applications for both Android and iOS
platforms. It also provides an extensible framework that you can
use to develop your own build rules.

WWW: https://bazel.build/

PR: 204512
Submitted by: Yuri Victorovich <yuri@rawbw.com>, Klaus Aehlig <aehlig@linta.de>
Reviewed by: peterj