Merge remote-tracking branch 'origin/topic/neverlord/avoid-openssl-header-deps'

* origin/topic/neverlord/avoid-openssl-header-deps:
  Integrate review feedback
  Avoid OpenSSL header dependencies

Added NEWS during merge and removed never set OPENSSL_INCLUDE_DIR reference
in main CMakeLists.txt.

NEWS

@@ -13,6 +13,16 @@ Breaking Changes
   namespace were changed to return a reference to a std::shared_ptr instead of a copy
   for performance reasons.
 
+- Zeek's ``OPENSSL_INCLUDE_DIR`` is not automatically added to an external plugin's
+  include path anymore. A plugin using OpenSSL functionality directly can use the
+  following explicit entry to re-use Zeek's ``OPENSSL_INCLUDE_DIR``:
+
+	zeek_add_plugin(
+		Namespace Name
+		INCLUDE_DIRS "${OPENSSL_INCLUDE_DIR}"
+		SOURCES ...
+	)
+
 New Functionality
 -----------------
 
@@ -49,6 +59,11 @@ Changed Functionality
 
 - Ed25519 and Ed448 DNSKEY and RRSIG entries do not cause weirds anymore.
 
+- The OpenSSL references in ``digest.h`` and ``OpaqueVal.h`` headers have been
+  hidden to avoid unneeded dependencies on OpenSSL headers. Plugins using the
+  detail API from ``digest.h`` to compute hashes likely need to accommodate for
+  this change.
+
 Removed Functionality
 ---------------------