audio/icecast-kh: Update to 2.4.0-kh10

• Convert to options helpers
• Drop incidental variables
• Reset maintainer due to the long timeout

Changes: https://raw.githubusercontent.com/karlheyes/icecast-kh/icecast-2.4.0-kh10/NEWS
PR: 230814
Reported by: shon@misproductions.com
Submitted by: Samy Mahmoudi <samy.mahmoudi@gmail.com> (based on)
Approved by: anes@anes.su (maintainer timeout, > 3 months)