Appveyor: Deactivate SSL for VS2019 / VS2022

It seems OpenSSL is not available in the build images for VS2019 and VS2022.
Test without it until there is time to analyze and fix the problem.
OpenSSL is still tested using VS2017.

appveyor.yml

@@ -219,7 +219,7 @@ environment:
       build_shared: NO
       no_files: NO
       enable_ipv6: YES
-      enable_ssl: YES
+      enable_ssl: NO
       enable_websockets: YES
       no_cgi: NO
       no_caching: NO
@@ -233,7 +233,7 @@ environment:
       build_shared: NO
       no_files: NO
       enable_ipv6: YES
-      enable_ssl: YES
+      enable_ssl: NO
       enable_websockets: YES
       no_cgi: NO
       no_caching: NO