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/qtwayland/Manifest

@@ -0,0 +1,4 @@
+DIST qtwayland-5.15.18-gentoo-kde-1.tar.xz 45732 BLAKE2B e9498684aad8205487a8beb6c6408851009b9eeb7ed8e5ae809f26bbb4e1ce5970bdabd0fc79562747b7af6acf5f77e0faea854a646e0039889c3ae7001afb8f SHA512 65851f53e2a534cb6aab8d547543a1864243a7dd07f8766cf68ba0bbfd2fca6e011f6b9a68beabf0f2b806eacd48adacf876f8ba571c7747dcfce6a5687bee7b
+DIST qtwayland-everywhere-opensource-src-5.15.18.tar.xz 547760 BLAKE2B e41148764c0926109a35ef62bdfd59b031c42ed245783400a139da872ee6a83f9e4480e357ebd7561c3eeacb4cac612e94d0817f4bbe5a66131fab3a5a3596d7 SHA512 9e0d07a4a91eb6dd1bde6b211bae2b64f2035a28176c277adb86ab5d3a281c7740930dc304db94990c1d2277ef54d17b934f99326413719626fb161b612c033f
+EBUILD qtwayland-5.15.18.ebuild 1355 BLAKE2B f0695c3fd47f83c913d9955644357c27c5c7baeb5f59e77bef39f69915d8d6d33cce27a2ce80c365e2ffd1b8d586c4aa7becdba36ea52514f2247662b234ef1d SHA512 ad8e8beecbd93c7f05848e9d24145df5019bb3b98f2dc74990a35b1badf55ef94b490c72cf2d727aa5c91577f4488e43ac4dcb28fcf0dbea120e943552ad4d1d
+MISC metadata.xml 888 BLAKE2B b893520d74518b0ea0d104d72545925ac37c818ef52d29a5551a2e3406ded90bc4f6c3d53b64868f2b39919cab783ed124af13f63704e7ee66c534c21dfdfb23 SHA512 9861bb9cf35100d7464d88f86614511522fc4cf7e2ef5d09b9ea95cdb168d61f645614104aacad24fcebc8ecfc2c98601b26f434059bffe169513fd097b12aec

dev-qt/qtwayland/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="compositor">Enable support for the wayland compositor / server APIs</flag>
+		<flag name="gnome">Build the GNOME-like decoration plugin (loaded by default with GNOME)</flag>
+		<flag name="qml">Build QML/QtQuick bindings and imports</flag>
+		<flag name="vulkan">Enable support for Vulkan-based server buffer integration</flag>
+	</use>
+	<upstream>
+		<bugs-to>https://bugreports.qt.io/</bugs-to>
+		<doc>https://doc.qt.io/</doc>
+		<remote-id type="github">qt/qtwayland</remote-id>
+	</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/qtwayland/qtwayland-5.15.18.ebuild

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+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# Looking for Qt 6? It is packaged differently to Qt 5 with different
+# package names: https://wiki.gentoo.org/wiki/Project:Qt/Qt6_migration_notes
+
+if [[ ${PV} != *9999* ]]; then
+	QT5_KDEPATCHSET_REV=1
+	KEYWORDS="amd64 arm arm64 ~hppa ~loong ppc ppc64 ~riscv x86"
+fi
+
+inherit qt5-build
+
+DESCRIPTION="Wayland platform plugin for Qt"
+
+SLOT=5/${QT5_PV} # bug 815646
+IUSE="compositor vulkan"
+
+RDEPEND="
+	dev-libs/wayland
+	=dev-qt/qtcore-${QT5_PV}*:5=
+	=dev-qt/qtgui-${QT5_PV}*:5=[egl,libinput,vulkan=]
+	media-libs/libglvnd
+	x11-libs/libxkbcommon
+	compositor? ( =dev-qt/qtdeclarative-${QT5_PV}*:5= )
+"
+DEPEND="${RDEPEND}
+	vulkan? ( dev-util/vulkan-headers )
+"
+BDEPEND="dev-util/wayland-scanner"
+
+src_configure() {
+	local myqmakeargs=(
+		--
+		-no-feature-xcomposite-egl
+		-no-feature-xcomposite-glx
+		$(qt_use compositor feature-wayland-server)
+		$(qt_use compositor feature-wayland-dmabuf-server-buffer)
+		$(qt_use compositor feature-wayland-drm-egl-server-buffer)
+		$(qt_use compositor feature-wayland-shm-emulation-server-buffer)
+	)
+
+	use compositor && myqmakeargs+=(
+		$(qt_use vulkan feature-wayland-vulkan-server-buffer)
+	)
+
+	qt5-build_src_configure
+}
+
+src_install() {
+	qt5-build_src_install
+	rm "${D}${QT5_BINDIR}"/qtwaylandscanner || die
+}