ae.net.ssl.openssl: Make deprecated setCipherList an override, not an alias

A `deprecated alias` does not override the base SSLContext virtual
method, so calls dispatched through an `SSLContext` reference would hit
the base's "not implemented" stub at runtime instead of the OpenSSL
implementation. Replace the alias with a deprecated `override` forwarder
and add a regression test that exercises virtual dispatch through the
base reference.

Author: Spike

net/ssl/openssl.d

@@ -250,7 +250,11 @@ class OpenSSLContext : SSLContext
 		}
 	}
 
-	deprecated alias setCipherList = setOpenSSLCipherList; /// ditto
+	deprecated("Use setOpenSSLCipherList directly on OpenSSLContext, or setCipherSuites for a portable alternative")
+	override void setCipherList(string[] ciphers)
+	{
+		setOpenSSLCipherList(ciphers);
+	} /// ditto
 
 	override void enableDH(int bits)
 	{
@@ -943,6 +947,14 @@ debug(ae_unittest) unittest
 	ctx.setCipherSuites(["TLS_AES_256_GCM_SHA384"]);
 }
 
+// Test that the deprecated setCipherList still works at runtime when called via SSLContext
+// base reference (does not hit the base's "not implemented" assert).
+deprecated debug(ae_unittest) unittest
+{
+	SSLContext ctx = new OpenSSLContext(SSLContext.Kind.client);
+	ctx.setCipherList(["HIGH"]); // virtual dispatch must reach OpenSSL impl
+}
+
 // Test setIdentityFromPKCS12: generate a self-signed cert in-memory and round-trip via PFX.
 debug(ae_unittest) unittest
 {