• remove DISTNAME, USE_GMAKE, HAS_CONFIGURE, MAKE_ENV
• simplify do-configure, .if !defined (NOPORTDATA) block
• use dirrmtry for share/applications, share/icons/oxygen

PR: ports/168175
Submitted by: nemysis <nemysis@gmx.ch> (maintainer)
Approved by: eadler, itetcu (mentors, implicit)