Remove irrelevant configs

Remove configuration files that are TLS-specific or otherwise not
relevant to a pure-crypto library.

tests/scripts/test-ref-configs.pl

@@ -17,16 +17,8 @@ use warnings;
 use strict;
 
 my %configs = (
-    'config-default.h' => {
-    },
-    'config-mini-tls1_1.h' => {
-    },
     'config-suite-b.h' => {
     },
-    'config-ccm-psk-tls1_2.h' => {
-    },
-    'config-thread.h' => {
-    },
 );
 
 # If no config-name is provided, use all known configs.