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/qtquicktimeline/qtquicktimeline-6.8.2.ebuild

@@ -0,0 +1,18 @@
+# Copyright 2021-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit qt6-build
+
+DESCRIPTION="Qt module for keyframe-based timeline construction"
+
+if [[ ${QT6_BUILD_TYPE} == release ]]; then
+	KEYWORDS="amd64 arm arm64 ~loong ppc ppc64 ~riscv x86"
+fi
+
+RDEPEND="
+	~dev-qt/qtbase-${PV}:6
+	~dev-qt/qtdeclarative-${PV}:6
+"
+DEPEND="${RDEPEND}"