Backport qt5 packages

Backport qt5 packages since they are removed from the main gentoo repos.

dev-qt/qtdeclarative/metadata.xml

@@ -0,0 +1,26 @@
+<?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="localstorage">Build the LocalStorage import for QtQuick (requires QtSql)</flag>
+		<flag name="network">Enable QtNetwork support</flag>
+		<flag name="opengl">Enable OpenGL support</flag>
+		<flag name="qmlls">Build the qmlls tool using <pkg>dev-qt/qtlanguageserver</pkg></flag>
+		<flag name="sql">Enable QtSQL support</flag>
+		<flag name="widgets">Enable QtWidgets support</flag>
+	</use>
+	<upstream>
+		<bugs-to>https://qt-project.atlassian.net/</bugs-to>
+		<doc>https://doc.qt.io/</doc>
+		<remote-id type="github">qt/qtdeclarative</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>