deskutils/sysctlview: update to 0.2

From ChangeLog: https://gitlab.com/alfix/sysctlview/blob/master/CHANGELOG

• change C GTK -> C++ GTKmm
• add menu
• add "node dialog" when a row is
• clicked
• add manual page "sysctlview.1"
• add TreeView "Main"
• delete
• TreeView "description"
• delete TreeView "values"
• delete TreeView "info"
• delete sysctlmibinfo.c/h (dynamic linking)
• delete sysctlview.window.xml

PR: 236762
Submitted by: alfix86@gmail.com (maintainer)