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/qdbusviewer/qdbusviewer-5.15.16.ebuild

@@ -0,0 +1,51 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+if [[ ${PV} != *9999* ]]; then
+	QT5_KDEPATCHSET_REV=1
+	KEYWORDS="amd64 ~arm arm64 ~hppa ppc64 x86"
+fi
+
+QT5_MODULE="qttools"
+inherit desktop qt5-build xdg-utils
+
+DESCRIPTION="Graphical tool that lets you introspect D-Bus objects and messages"
+
+IUSE=""
+
+DEPEND="
+	=dev-qt/qtcore-${QT5_PV}*
+	=dev-qt/qtdbus-${QT5_PV}*
+	=dev-qt/qtgui-${QT5_PV}*
+	=dev-qt/qtwidgets-${QT5_PV}*
+	=dev-qt/qtxml-${QT5_PV}*
+"
+RDEPEND="${DEPEND}
+	!dev-qt/${PN}:5
+	!<dev-qt/qtchooser-66-r2
+"
+
+QT5_TARGET_SUBDIRS=(
+	src/qdbus/qdbusviewer
+)
+
+src_install() {
+	qt5-build_src_install
+	qt5_symlink_binary_to_path qdbusviewer
+
+	doicon -s 32 src/qdbus/qdbusviewer/images/qdbusviewer.png
+	newicon -s 128 src/qdbus/qdbusviewer/images/qdbusviewer-128.png qdbusviewer.png
+	make_desktop_entry "${QT5_BINDIR}"/qdbusviewer 'Qt 5 QDBusViewer' qdbusviewer 'Qt;Development'
+}
+
+pkg_postinst() {
+	qt5-build_pkg_postinst
+	xdg_icon_cache_update
+}
+
+pkg_postrm() {
+	qt5-build_pkg_postrm
+	xdg_icon_cache_update
+}