audio/lollypop: Update 0.9.15 -> 0.9.521

Port changes:

• greg@unrelenting.technology takes maintainership
• Build changed to meson
• MASTER_SITES replaced with gitlab GL_xx
• Add USE_PYTHON=noflavors
• Use DISTVERSION
• Change LICENSE_FILE

PR: 226836
Submitted by: Greg V <greg@unrelenting.technology>