multimedia/qmmp-plugin-pack: Update to 0.10.3

[ultima]

Summary

• Updated to 0.10.3
• Cleanup Makefile
• Add license file

PR\: 221248
Submitted by\: SimaMoto,RyōTa (maintainer)
Reviewed by\: lifanov (mentor), matthew (mentor)
Approved by\: lifanov (mentor), matthew (mentor)
Differential Revision\: https://reviews.freebsd.org/DXXXXX

Test Plan

portlint:
WARN: Makefile: for new port, make $FreeBSD$ tag in comment section empty, to make SVN happy.
0 fatal errors and 1 warning found.

poudriere:
103i386
103amd64
110i386
110amd64
12i386
12amd64

[matthew]