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/qtquickcontrols/Manifest

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+DIST qtquickcontrols-everywhere-opensource-src-5.15.18.tar.xz 5960964 BLAKE2B d380286f20257bacdf86a6aa97b8e935d9b5477bb25f54ddc97bbdf1adf208ab0ade48463dd9905b98eb2c99a05ef81b55fa452d75287235f58adef14cc16e80 SHA512 9bd2bcd119d162f8ef30b2e1f459776a66b504f5043809cc0846b7c4898ca464eb44f65d1c76d3857a12eef7126ec8a84f8ac3566b5c3200b65572a3ff9296f7
+EBUILD qtquickcontrols-5.15.18.ebuild 772 BLAKE2B 0975fb966853a24dd19081cc3cf4af8522200e21acebf880c9d8ea7db6dd4b1cee00c924d7b9aab95d75a3acf8636deeb92fdb4a95dc36316992be2a0ace275e SHA512 cdcada4e6a1f6b8d28506afe8656c27c89bb6b00c0ac4eba74681e4f0ac5ebc064d257d5d7236751a12b236598a89cb8c071f513503d0f6c1929b8291852c838
+MISC metadata.xml 552 BLAKE2B 8294b8e326a177905eb8b0510295d6b3cc97818c836b6b5d2940b78a5ecccc743c8818436fee3f3a61b2f984560c6fe6346d44e1e6b4fa27a7cf5a9a84f20dd4 SHA512 25f93b07946f9319e9762b9ba6c9adb5ca6348a71ebd5710c0f1690a75ca7f93af8967f323a9e11e7af04fd970a92fedf3ec30d962f85516c7b44f1ea749dbbf

dev-qt/qtquickcontrols/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://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>

dev-qt/qtquickcontrols/qtquickcontrols-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
+
+inherit qt5-build
+
+DESCRIPTION="Set of Qt Quick controls to create complete user interfaces (deprecated)"
+
+if [[ ${QT5_BUILD_TYPE} == release ]]; then
+	KEYWORDS="amd64 ~arm arm64 ~hppa ~loong ppc ppc64 ~riscv x86"
+fi
+
+IUSE="+widgets"
+
+DEPEND="
+	=dev-qt/qtcore-${QT5_PV}*
+	=dev-qt/qtdeclarative-${QT5_PV}*
+	=dev-qt/qtgui-${QT5_PV}*
+	widgets? ( =dev-qt/qtwidgets-${QT5_PV}* )
+"
+RDEPEND="${DEPEND}"
+
+src_prepare() {
+	qt_use_disable_mod widgets widgets \
+		src/src.pro \
+		src/controls/Private/private.pri \
+		tests/auto/activeFocusOnTab/activeFocusOnTab.pro \
+		tests/auto/controls/controls.pro \
+		tests/auto/testplugin/testplugin.pro
+
+	qt5-build_src_prepare
+}