Tests: CA list handling with Net::SSLeay with LibreSSL. LibreSSL is not able to work with CA lists (certificate_authorities extension) when using TLSv1.3. As such, relevant tests fail if Net::SSLeay is compiled with LibreSSL. Notably, this affects macOS, where Net::SSLeay compiled with LibreSSL is shipped with the OS. Fix is to mark relevant tests as TODO if Net:SSLeay is compiled with LibreSSL, similarly to what we already do for TLSv1.3 CA list issues in LibreSSL on the server side.

--- a/ssl_verify_client.t
+++ b/ssl_verify_client.t
@@ -158,6 +158,8 @@ skip 'Net::SSLeay version >= 1.36 requir
 TODO: {
 local $TODO = 'broken TLSv1.3 CA list in LibreSSL'
 	if $t->has_module('LibreSSL') && test_tls13();
+local $TODO = 'no TLSv1.3 CA list in Net::SSLeay (LibreSSL)'
+	if Net::SSLeay::constant("LIBRESSL_VERSION_NUMBER") && test_tls13();
 
 my $ca = join ' ', get('optional', '3.example.com');
 is($ca, '/CN=2.example.com', 'no trusted sent');