temp: fix arch of new temp packages from the Unity 8 MR (!220)

lightdm, lttng-tools: build for all instead of x86_64 only.

[skip ci]: already ran in CI successfully

temp/lightdm/APKBUILD

@@ -4,7 +4,7 @@ pkgver=9999
 pkgrel=0
 pkgdesc="A cross-desktop display manager"
 url="https://www.freedesktop.org/wiki/Software/LightDM"
-arch="x86_64"
+arch="all"
 license="GPL-3.0-or-later"
 depends="dbus xinit accountsservice"
 makedepends="linux-pam-dev gtk+3.0-dev libxext-dev libxklavier-dev

temp/lttng-tools/APKBUILD

@@ -3,7 +3,7 @@ pkgver=2.10.5
 pkgrel=0
 pkgdesc="LTTng 2.0 control and utility programs"
 url="https://lttng.org"
-arch="x86_64 !aarch64"
+arch="all !aarch64"
 license="GPL-2.0"
 depends="babeltrace"
 depends_dev="popt-dev libxml2-dev userspace-rcu-dev lttng-ust-dev kmod-dev