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/qtlockedfile/Manifest

@@ -0,0 +1 @@
+DIST qt-solutions-20171024.tar.xz 710532 BLAKE2B 365f4c6fc3bee34bf26ac5039984ceac1d90527297b985b0d1b606f3ba67219bab7f7cba40b4adca55446c34e9f4fe218b4449ee255ba6f6409de78f80ccdaec SHA512 4784d88c2f40c88f06abeb728842875fb5e428a630dbf749f71055681b0c631803d2901b60aa8cc95f5f382dcd21da8d739873aa45e3dd3676ee95925f0198da

dev-qt/qtlockedfile/files/qtlockedfile.prf

@@ -0,0 +1,6 @@
+INCLUDEPATH *= $$[QT_INSTALL_HEADERS]/QtSolutions
+greaterThan(QT_MAJOR_VERSION, 4) {
+LIBS *= -lQt$${QT_MAJOR_VERSION}Solutions_LockedFile-2.4
+} else {
+LIBS *= -lQtSolutions_LockedFile-2.4
+}

dev-qt/qtlockedfile/metadata.xml

@@ -0,0 +1,8 @@
+<?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>
+</pkgmetadata>

dev-qt/qtlockedfile/qtlockedfile-2.4.1_p20171024.ebuild

@@ -0,0 +1,50 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+MY_P=qt-solutions-${PV#*_p}
+inherit qmake-utils
+
+DESCRIPTION="QFile extension with advisory locking functions"
+HOMEPAGE="https://code.qt.io/cgit/qt-solutions/qt-solutions.git/"
+SRC_URI="https://dev.gentoo.org/~pesa/distfiles/${MY_P}.tar.xz"
+S="${WORKDIR}/${MY_P}/${PN}"
+
+LICENSE="|| ( LGPL-2.1 GPL-3 )"
+SLOT="0"
+KEYWORDS="amd64 ~arm ~arm64 ~hppa ~ppc ~ppc64 ~riscv x86"
+IUSE="doc"
+
+DEPEND="dev-qt/qtcore:5"
+RDEPEND="${DEPEND}"
+
+src_prepare() {
+	default
+
+	echo 'SOLUTIONS_LIBRARY = yes' > config.pri
+	echo 'QT -= gui' >> src/qtlockedfile.pri
+
+	sed -i -e "s/-head/-${PV%.*}/" common.pri || die
+	sed -i -e '/SUBDIRS+=example/d' ${PN}.pro || die
+}
+
+src_configure() {
+	eqmake5
+}
+
+src_install() {
+	use doc && local HTML_DOCS=( doc/html/. )
+	einstalldocs
+
+	# libraries
+	dolib.so lib/*
+
+	# headers
+	insinto "$(qt5_get_headerdir)"/QtSolutions
+	doins src/QtLockedFile src/${PN}.h
+
+	# .prf files
+	insinto "$(qt5_get_mkspecsdir)"/features
+	doins "${FILESDIR}"/${PN}.prf
+}