NTLM_WB: drop support

The feature has not worked for months and has been marked as DEPRECATED
for six+ months.

Closes #13249

docs/DEPRECATE.md

@@ -12,21 +12,6 @@ email the
 as soon as possible and explain to us why this is a problem for you and
 how your use case cannot be satisfied properly using a workaround.
 
-## NTLM_WB auth
-
-This NTLM authentication method is powered by a separate tool,
-`ntlm_auth`. Barely anyone uses this method. It was always a quirky
-implementation (including fork + exec), it has limited portability and we do
-not test it in the test suite and CI.
-
-We keep the native NTLM implementation.
-
-Due to a mistake, the `NTLM_WB` functionality is missing in builds since 8.4.0
-(October 2023). It needs to be manually patched to work. See [PR
-12479](https://github.com/curl/curl/pull/12479).
-
-curl removes the support for NTLM_WB auth in April 2024.
-
 ## space-separated `NOPROXY` patterns
 
 When specifying patterns/domain names for curl that should *not* go through a
@@ -56,3 +41,4 @@ curl removes the support for space-separated names in July 2024.
  - NSS
  - gskit
  - mingw v1
+ - NTLM_WB