qt5-qtx11-extras: temporarily copy from Alpine

Until their build-edge-aarch64 isn't stuck anymore.

aports/temp/qt5-qtx11extras/APKBUILD

@@ -0,0 +1,49 @@
+# Copied from Alpine because their build-edge-aarch64 is stuck
+pkgname=qt5-qtx11extras
+_pkgname=qtx11extras-everywhere-src
+pkgver=5.10.1
+_ver=${pkgver/_p/-}
+_ver=${_ver/_/-}
+_ver=${_ver/beta0/beta}
+_ver=${_ver/rc0/rc}
+_V=${_ver/rc/RC}
+pkgrel=1
+pkgdesc="Provides platform-specific APIs for X11"
+url="http://qt-project.org/"
+arch="all"
+license="GPL-3.0"
+makedepends="qt5-qtbase-dev"
+subpackages="$pkgname-dev"
+replaces="qt5-x11extras"
+
+case $pkgver in
+*_beta*|*_rc*) _rel=development_releases;;
+*) _rel=official_releases;;
+esac
+source="http://download.qt-project.org/$_rel/qt/${pkgver%.*}/$_ver/submodules/$_pkgname-$_V.tar.xz"
+
+builddir="$srcdir"/$_pkgname-${_V%-*}
+
+prepare() {
+	default_prepare
+	cd "$builddir"
+	mkdir -p build
+}
+
+build() {
+	cd "$builddir"/build
+	qmake-qt5 ..
+	make
+}
+
+check() {
+	cd "$builddir"/build
+	make check
+}
+
+package() {
+	cd "$builddir"/build
+	make INSTALL_ROOT="$pkgdir" install
+}
+
+sha512sums="b429aa066c49d0f58f88fb774b49643eea21e41aa5ebfb03c2b4ba53c42a07bddc793a228b3a7cbf3bc57bd02879659a3ce7aeff260b77f4b8adc75a0b556778  qtx11extras-everywhere-src-5.10.1.tar.xz"