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/qtquickcontrols2/Manifest

@@ -0,0 +1,2 @@
+DIST qtquickcontrols2-5.15.18-gentoo-kde-1.tar.xz 6284 BLAKE2B 8a9aec66bb75cd45b4cc96162b6cd55a98f357938903d1544b72c9de120389f4c01314cc7c0e04cfcac5908c798695f9f50942ccf682e09d62dfff5c65a5ed86 SHA512 044d06524317aad9b234136a758cd0db0af514ba022a3cd7777544136579a7fcc52fe156cf1e9e11c5fdab7a980d78f088eb82f7a83ec3d660c760df7a580182
+DIST qtquickcontrols2-everywhere-opensource-src-5.15.18.tar.xz 8272372 BLAKE2B 414255b06745b2ec8f7aaaf18ba0971e31f28d8f8756c744b64a5e2faa03f3b62c22c3f06b794f11e940275204166ec1d3d269c73ef5bd8df6a0649485ba88a6 SHA512 29d0904c949b4970eae576d20f94b5c92f1fcb71056bb085b6ea8421c894aa265ae9a5cdbd6e21ac849f14385833ed2961a18dcc2c66ea6ed8a28feb51bd7375

dev-qt/qtquickcontrols2/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>
+	<use>
+		<flag name="widgets">Enable QtWidgets support</flag>
+	</use>
+	<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>

dev-qt/qtquickcontrols2/qtquickcontrols2-5.15.18.ebuild

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+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+if [[ ${PV} != *9999* ]]; then
+	QT5_KDEPATCHSET_REV=1
+	KEYWORDS="amd64 ~arm arm64 ~loong ppc64 ~riscv x86"
+fi
+
+inherit qt5-build
+
+DESCRIPTION="Set of next generation Qt Quick controls for the Qt5 framework"
+
+IUSE="widgets"
+
+DEPEND="
+	=dev-qt/qtcore-${QT5_PV}*
+	=dev-qt/qtdeclarative-${QT5_PV}*
+	=dev-qt/qtgui-${QT5_PV}*
+	widgets? ( =dev-qt/qtwidgets-${QT5_PV}* )
+"
+RDEPEND="${DEPEND}
+	=dev-qt/qtgraphicaleffects-${QT5_PV}*
+"
+
+src_prepare() {
+	qt_use_disable_mod widgets widgets \
+		src/imports/platform/platform.pro
+
+	qt5-build_src_prepare
+}