Tests: compatibility with "openssl" app from OpenSSL 3.2.0. OpenSSL 3.2.0's "openssl" app generates X.509v3 certificates unless explicitly asked not to. Such certificates, even self-signed ones, cannot be used to sign other certificates without CA:TRUE explicitly set in the basicConstraints extension. As a result, tests doing so are now failing. Fix is to provide basicConstraints with CA:TRUE for self-signed root certificates used in "openssl ca" calls.

--- a/ssl_certificate_chain.t
+++ b/ssl_certificate_chain.t
@@ -71,7 +71,10 @@ my $d = $t->testdir();
 default_bits = 2048
 encrypt_key = no
 distinguished_name = req_distinguished_name
+x509_extensions = myca_extensions
 [ req_distinguished_name ]
+[ myca_extensions ]
+basicConstraints = critical,CA:TRUE
 EOF
 
 $t->write_file('ca.conf', <<EOF);