Revert /dev sharing improvements.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.664.26) UNRELEASED; urgency=medium
+
+  * Revert previous change of fixing /dev sharing - this causes weird
+    autopkgtest issues.
+
+ -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@ubuntu.com>  Mon, 02 Aug 2021 22:13:03 +0200
+
 livecd-rootfs (2.664.25) focal; urgency=medium
 
   [ Brian Murray ]

live-build/functions

@@ -102,7 +102,6 @@ setup_mountpoint() {
     fi
 
     mount --rbind /dev "$mountpoint/dev"
-    mount --make-rslave "$mountpoint/dev"
     mount proc-live -t proc "$mountpoint/proc"
     mount sysfs-live -t sysfs "$mountpoint/sys"
     mount securityfs -t securityfs "$mountpoint/sys/kernel/security"