Log Message:
Import libasr-1.0.2 as net/libasr. Based on PR pkg/51106 by ISIHARA Takanori.

libasr is a FREE asynchronous DNS resolver.

libasr runs on top of the OpenBSD operating system but also has a portable
version that can build and run on several systems, including:

* Linux
* FreeBSD
* NetBSD
* DragonFly
* MacOSX