Tests: Remove t_emit_memb_limit/vltmt as slow

test_regress/t/t_emit_memb_limit.pl

@@ -9,7 +9,8 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 # SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
 use IO::File;
 
-scenarios(simulator => 1);
+# Very slow on vltmt, and doesn't test much of value there, so disabled
+scenarios(vlt => 1);
 
 sub gen {
     my $filename = shift;