Add new package for pvr.eon

[Nirvana777]

I’ve created following package for pvr.eon

# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2017-present Team LibreELEC (https://libreelec.tv)

PKG_NAME="pvr.eon"
PKG_VERSION="21.6.0-Omega"
PKG_SHA256="19971d4d376f3d6f09515d8f20b6c68b2995d034e255b408a3dfaa7c1c4f9aa0"
PKG_REV="1"
PKG_ARCH="any"
PKG_LICENSE="GPL"
PKG_SITE="https://github.com/nirvana-7777/pvr.eon"
PKG_URL="https://github.com/nirvana-7777/pvr.eon/archive/${PKG_VERSION}.tar.gz"
PKG_DEPENDS_TARGET="toolchain kodi-platform rapidjson"
PKG_SECTION=""
PKG_SHORTDESC="pvr.eon"
PKG_LONGDESC="pvr.eon"

PKG_IS_ADDON="yes"
PKG_ADDON_TYPE="xbmc.pvrclient"

I’ve put it into:
CoreELEC/packages/mediacenter/kodi-binary-addons/pvr.eon

When I test building it following these instructions:
https://github.com/CoreELEC/coreelec-builder
I run into error prior to the addon itself.

Error message reads:

CMake Error at cmake/StdFilesystem.cmake:22 (message):
  Toolchain doesn't support std::filesystem with nor without -lstdc++fs
Call Stack (most recent call first):
  cmake/StandardSettings.cmake:57 (include)
  CMakeLists.txt:70 (include)

Trying to build package with:
PROJECT=Amlogic-ce DEVICE=Amlogic-ng ARCH=arm ./scripts/create_addon pvr.eon

Can someone please:
a) give advice on the build error
b) try to build the package on a working build environment
c) add the addon to the coreelec distribution