Clean up BMCWEB_ENABLE_SSL

This macro came originally from CROW_ENABLE_SSL, and was used as a macro
to optionally compile without openssl being required.

OpenSSL has been pulled into many other dependencies, and has been
functionally required to be included for a long time, so there's no
reason to hold onto this macro.

Remove most uses of the macro, and for the couple functional places the
macro is used, transition to a constexpr if to enable the TLS paths.

This allows a large simplification of code in some places.

Tested: Redfish service validator passes.

Change-Id: Iebd46a68e5e417b6031479e24be3c21bef782f4c
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/config/meson.build b/config/meson.build
index 21da40e..1c6f78a 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -19,6 +19,10 @@
 conf_data.set10('BMCWEB_ENABLE_MULTI_HOST', enable_multi_host.allowed())
 enable_http2 = get_option('experimental-http2')
 conf_data.set10('BMCWEB_ENABLE_HTTP2', enable_http2.allowed())
+
+enable_tls = get_option('insecure-disable-ssl')
+conf_data.set10('BMCWEB_ENABLE_TLS', enable_tls.disabled())
+
 conf_data.set10(
     'BMCWEB_ENABLE_MTLS_COMMON_NAME_PARSING_META',
     get_option('mutual-tls-common-name-parsing') == 'meta',