Integrate ossl_shim into the build

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>

Configure

diff --git a/Configure b/Configure
index 884f7bd..70ae456 100755
--- a/Configure
+++ b/Configure
@@ -316,6 +316,8 @@
     "evp", "asn1", "pem", "x509", "x509v3", "conf", "txt_db", "pkcs7", "pkcs12", "comp", "ocsp", "ui",
     "cms", "ts", "srp", "cmac", "ct", "async", "kdf"
     ];
+# test/ subdirectories to build
+$config{tdirs} = [ "ossl_shim" ];
 
 # Known TLS and DTLS protocols
 my @tls = qw(ssl3 tls1 tls1_1 tls1_2 tls1_3);
@@ -1426,6 +1428,10 @@
         push @build_infos, [ catdir("engines", $_), "build.info" ]
             if (-f catfile($srcdir, "engines", $_, "build.info"));
     }
+    foreach (@{$config{tdirs}}) {
+        push @build_infos, [ catdir("test", $_), "build.info" ]
+            if (-f catfile($srcdir, "test", $_, "build.info"));
+    }
 
     $config{build_infos} = [ ];