Reapply "dev-embedded/etlcpp: treeclean"

This reverts commit 460255efd8f5aa47be1f0966609dc6b49ef025ad.

Signed-off-by: Julien Roy <julien@jroy.ca>

dev-embedded/etlcpp/Manifest

@@ -1 +0,0 @@
-DIST etlcpp-20.35.8.tar.gz 4413632 BLAKE2B b8292ea0395dbd0ef7d77d58dc2cb1cca16822da39054c1937e3f2a6b5828f9c2816e91b6c9ca4ef2088cdc691245d1aadf9f9c9283fa293265520c3fd4352db SHA512 d417760dd35ad5796f9ce8b7f96ac2d71f7b8e4896e5fc12e844912f34f867dee13582d2621521b5dfa66f21cd77abfd4e48a11e71fe87de2f98eaa6dcf6204f

dev-embedded/etlcpp/etlcpp-20.35.8.ebuild

@@ -1,25 +0,0 @@
-# Copyright 1999-2022 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-inherit cmake
-
-DESCRIPTION="A C++ template library for embedded applications"
-HOMEPAGE="https://www.etlcpp.com/"
-SRC_URI="https://github.com/ETLCPP/etl/archive/refs/tags/${PV}.tar.gz -> ${P}.tar.gz"
-
-S="${WORKDIR}/etl-${PV}"
-
-LICENSE="MIT"
-SLOT="0"
-KEYWORDS="~amd64"
-IUSE="test"
-RESTRICT="!test? ( test )"
-
-src_configure() {
-	local mycmakeargs=(
-		-DBUILD_TESTS=$(usex test)
-	)
-	cmake_src_configure
-}

dev-embedded/etlcpp/metadata.xml

@@ -1,27 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
-<pkgmetadata>
-  <maintainer type="person">
-    <name>Jan Henke</name>
-    <email>gentoo@taujhe.de</email>
-    <description>Primary maintainer</description>
-</maintainer>
-  <longdescription>
-    C++ is a great language to use for embedded applications and templates are
-    a powerful aspect. The standard library can offer a great deal of well
-    tested functionality, but there are some parts of the standard library that
-    do not fit well with deterministic behaviour and limited resource
-    requirements. These limitations usually preclude the use of dynamically
-    allocated memory and containers with open ended sizes.
-
-    What is needed is a template library where the user can declare the size,
-    or maximum size of any object upfront. Most embedded compilers do not
-    currently support the standard beyond C++ 03, therefore excluding the
-    programmer from	using the enhanced features of the later library.
-
-    This is what the ETL attempts to achieve.
-  </longdescription>
-  <upstream>
-    <remote-id type="github">ETLCPP/etl</remote-id>
-  </upstream>
-</pkgmetadata>