[lxqt] set Qt software render to speed up sddm login

cd71836e · Dan Johansen · 9d9d2c1a · cd71836e
Commit cd71836e authored 5 years ago by Dan Johansen
--- a/overlays/lxqt/etc/environment
+++ b/overlays/lxqt/etc/environment
+#
+# This file is parsed by pam_env module
+#
+# Syntax: simple "KEY=VAL" pairs on separate lines
+#
+QT_QUICK_BACKEND=software