Add dev-qt from an older version of the gentoo repo

Qt5 has been removed, we restore it since we still use it.

dev-qt/assistant/Manifest

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+DIST qttools-5.15.16-gentoo-kde-1.tar.xz 2340 BLAKE2B 442295bb3dc671067b6555139e016002e5e088ed6e777bb2348e74c893856fe353a6c8dc0376e5657b228324ee5a0719f1e1c5fbbcb8e86aa3b3325f6a4bb884 SHA512 b34f1de482a633d24543429e33944ee97464ea6b655cdd3c23a7c39dc569125268f25008623f7384574a637ef0460d160c42d9010d0e82d693df5be006c16702
+DIST qttools-everywhere-opensource-src-5.15.16.tar.xz 8888944 BLAKE2B abe5a62763c40fd9f41aaf78384913cf4831dc92b09caef14420dc844821ee4f6439050615afc30c33e45ed27c0560c1f0ada5c7d38c49f9f1da747694d5ae35 SHA512 5e81de37a5d429dd14d254a0257e6d1ca37c04a92b506d13d918fd3eb799c026978d3d673f6db0f393b598f520cf3a5d647c66de76308f9de9ac5c6951ed9f6b

dev-qt/assistant/assistant-5.15.16.ebuild

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+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+if [[ ${PV} != *9999* ]]; then
+	QT5_KDEPATCHSET_REV=1
+	KEYWORDS="amd64 ~arm arm64 ~hppa ppc64 x86"
+fi
+
+QT5_MODULE="qttools"
+inherit desktop qt5-build xdg-utils
+
+DESCRIPTION="Tool for viewing on-line documentation in Qt help file format"
+
+IUSE=""
+
+DEPEND="
+	=dev-qt/qtcore-${QT5_PV}*:5=
+	=dev-qt/qtgui-${QT5_PV}*[png]
+	=dev-qt/qthelp-${QT5_PV}*
+	=dev-qt/qtnetwork-${QT5_PV}*
+	=dev-qt/qtprintsupport-${QT5_PV}*
+	=dev-qt/qtsql-${QT5_PV}*[sqlite]
+	=dev-qt/qtwidgets-${QT5_PV}*
+"
+RDEPEND="${DEPEND}
+	!dev-qt/${PN}:5
+	!<dev-qt/qtchooser-66-r2
+"
+
+QT5_TARGET_SUBDIRS=(
+	src/assistant/assistant
+)
+
+src_prepare() {
+	sed -e "s/qtHaveModule(webkitwidgets)/false/g" \
+		-i src/assistant/assistant/assistant.pro || die
+
+	qt5-build_src_prepare
+}
+
+src_install() {
+	qt5-build_src_install
+	qt5_symlink_binary_to_path assistant
+
+	doicon -s 32 src/assistant/assistant/images/assistant.png
+	newicon -s 128 src/assistant/assistant/images/assistant-128.png assistant.png
+	make_desktop_entry "${QT5_BINDIR}"/assistant 'Qt 5 Assistant' assistant 'Qt;Development;Documentation'
+}
+
+pkg_postinst() {
+	qt5-build_pkg_postinst
+	xdg_icon_cache_update
+}
+
+pkg_postrm() {
+	qt5-build_pkg_postrm
+	xdg_icon_cache_update
+}

dev-qt/assistant/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>qt@gentoo.org</email>
+		<name>Gentoo Qt Project</name>
+	</maintainer>
+	<upstream>
+		<bugs-to>https://bugreports.qt.io/</bugs-to>
+		<doc>https://doc.qt.io/</doc>
+	</upstream>
+	<slots>
+		<subslots>
+			Must only be used by packages that are known to use private parts of the Qt API.
+		</subslots>
+	</slots>
+</pkgmetadata>