Additonal removals of engine references in tests/*

Spotted by @andrewkdinh, some extra notes about/useages of engines that
are now vestigial.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Saša Nedvědický <sashan@openssl.org>
Reviewed-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Norbert Pocs <norbertp@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/29305)

test/README-dev.md

@@ -29,7 +29,7 @@ The number `{nn}` is (somewhat loosely) grouped as follows:
     15-19  individual asymmetric cipher algorithms
     20-24  openssl commands (some otherwise not tested)
     25-29  certificate forms, generation and verification
-    30-35  engine and evp
+    30-35  evp
     60-79  APIs:
        60  X509 subsystem
        61  BIO subsystem

test/helpers/ssltestlib.c

@@ -9,7 +9,6 @@
 
 #include <string.h>
 
-#include <openssl/engine.h>
 #include "internal/e_os.h"
 #include "internal/nelem.h"
 #include "ssltestlib.h"

test/run_tests.pl

@@ -70,7 +70,6 @@ if (!defined($jobs)) {
 $ENV{OPENSSL_CONF} = rel2abs(catfile($srctop, "apps", "openssl.cnf"));
 $ENV{OPENSSL_CONF_INCLUDE} = rel2abs(catdir($bldtop, "test"));
 $ENV{OPENSSL_MODULES} = rel2abs(catdir($bldtop, "providers"));
-$ENV{OPENSSL_ENGINES} = rel2abs(catdir($bldtop, "engines"));
 $ENV{CTLOG_FILE} = rel2abs(catfile($srctop, "test", "ct", "log_list.cnf"));
 
 # On platforms that support this, this will ensure malloc returns data that is

test/sslbuffertest.c

@@ -8,14 +8,6 @@
  * or in the file LICENSE in the source distribution.
  */
 
-/*
- * We need access to the deprecated low level Engine APIs for legacy purposes
- * when the deprecated calls are not hidden
- */
-#ifndef OPENSSL_NO_DEPRECATED_3_0
-# define OPENSSL_SUPPRESS_DEPRECATED
-#endif
-
 #include <string.h>
 #include <openssl/ssl.h>
 #include <openssl/bio.h>