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/linguist-tools/Manifest

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+DIST qttools-5.15.18-gentoo-kde-1.tar.xz 2336 BLAKE2B 0ddc602b0b0edddbd7ff5cb435a6ab63ea4c9a159513c3b42e553ad68fb297239893b1d55e1ed1ff143d7af624e4d47cd07e5e2e564f4fe022b987b589f8d05d SHA512 e96f2d01a3526b1ebc3fb9afd04a38b42336d159961f53e348798cd0c4548abdae96569b670521b077daaf2fd64a29eedf9dd3b0cb7a131d5ec77deaec37cb5e
+DIST qttools-everywhere-opensource-src-5.15.18.tar.xz 8876416 BLAKE2B f546692ac9faccd617838432c001f7d574c7137ff44326d6d1e207a3eea913592c7857a15c91cbbadf0451512c256f4a99d43694b35f84fc758aa2a55118be75 SHA512 30a278df553ff3bb64927a4a5be0370b070131ec2970410095b4618e6a0f6e7c45374abf37c458b69dd9e4f7cecb98289b8e777cf5bc85b09f0b5cd278a40a70

dev-qt/linguist-tools/linguist-tools-5.15.18.ebuild

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+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+if [[ ${PV} != *9999* ]]; then
+	QT5_KDEPATCHSET_REV=1
+	KEYWORDS="amd64 arm arm64 ~hppa ~loong ppc ppc64 ~riscv x86"
+fi
+
+QT5_MODULE="qttools"
+inherit qt5-build
+
+DESCRIPTION="Tools for working with Qt translation data files"
+
+IUSE="qml"
+
+DEPEND="
+	=dev-qt/qtcore-${QT5_PV}*:5=
+	=dev-qt/qtxml-${QT5_PV}*
+	qml? ( =dev-qt/qtdeclarative-${QT5_PV}* )
+"
+RDEPEND="${DEPEND}"
+
+QT5_TARGET_SUBDIRS=(
+	src/linguist
+)
+
+src_prepare() {
+	sed -i -e '/SUBDIRS += linguist/d' \
+		src/linguist/linguist.pro || die
+
+	qt_use_disable_mod qml qmldevtools-private \
+		src/linguist/lupdate/lupdate.pro
+
+	qt5-build_src_prepare
+}

dev-qt/linguist-tools/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<use>
+		<flag name="qml">Enable QML support in lupdate</flag>
+	</use>
+	<maintainer type="project">
+		<email>qt@gentoo.org</email>
+		<name>Gentoo Qt Project</name>
+	</maintainer>
+	<upstream>
+		<bugs-to>https://qt-project.atlassian.net/</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>