New port: audio/lilv

Lilv is a C library to make the use of LV2 plugins as simple as possible
for applications. Lilv is the successor to SLV2, rewritten to be significantly
faster and have minimal dependencies. It is stable, well-tested
software (the included test suite covers over 90% of the code) in use
by several applications.

WWW: http://drobilla.net/software/lilv/

PR: 213290
Submitted by: Michael Beer <beerml@sigma6audio.de>
Reviewed by: Yuri Victorovich <yuri@rawbw.com>