main/postmarketos-ui-lxqt: enable on riscv64 (MR 4623)

It was disabled because Alpine riscv64 builder was behind. But now it's
fine again.

main/postmarketos-ui-lxqt/APKBUILD

@@ -2,12 +2,11 @@
 # Maintainer: Antoni Aloy <aaloytorrens@gmail.com>
 pkgname=postmarketos-ui-lxqt
 pkgver=0.2
-pkgrel=0
+pkgrel=1
 pkgdesc="(X11) Lightweight Qt Desktop Environment (stylus recommended)"
 url="https://lxqt-project.org/"
 # armhf: lxqt-desktop not available
-# riscv64: qt5-qtbase needs rebuild in alpine, builder is currently stuck
-arch="noarch !armhf !riscv64"
+arch="noarch !armhf"
 license="GPL-3.0-or-later"
 depends="
 	dbus-x11