Remove experimental code related to x509

This code might be restored in some form in the future, but as of now it does
not compile any more, so it is removed. We remove the `XFFI` cabal flag as well.
It has no effect now that the experimental `x509` code is moved.

Author: jorisdral

botan-bindings/CHANGELOG.md

@@ -1,5 +1,22 @@
 # Changelog
 
+## ?.?.?.? -- ????-??-??
+
+* BREAKING: remove experimental FFI code related to `x509`. This code might be
+  restored in some form in the future, but as of now it does not compile any
+  more, so it is removed. The modules that are removed are:
+  - `Botan.Bindings.X509.CA`
+  - `Botan.Bindings.X509.CRL`
+  - `Botan.Bindings.X509.CSR`
+  - `Botan.Bindings.X509.DN`
+  - `Botan.Bindings.X509.Extensions`
+  - `Botan.Bindings.X509.OCSP`
+  - `Botan.Bindings.X509.Options`
+  - `Botan.Bindings.X509.Path`
+  - `Botan.Bindings.X509.Store`
+* BREAKING: remove the `XFFI` cabal flag. It has no effect now that the
+  experimental `x509` code is moved.
+
 ## 0.1.0.0 -- 2025-09-17
 
 * PATCH: update the changelog to change the release date of version 0.0.1.0 from

botan-bindings/botan-bindings.cabal

@@ -46,11 +46,6 @@ flag pkg-config
   manual:      False
   description: Use @pkg-config(1)@ to locate foreign @botan-3@ library.
 
-flag XFFI
-  description: Enable experimental / upstream ffi support
-  manual:      True
-  default:     False
-
 library
   hs-source-dirs:     src
   default-language:   Haskell2010
@@ -120,17 +115,3 @@ library
     extra-libraries: botan-3
 
   ghc-options:        -Wall -Wno-name-shadowing
-
-  if flag(xffi)
-    -- Botan.Bindings.X509.OCSP
-    exposed-modules:
-      Botan.Bindings.X509.CA
-      Botan.Bindings.X509.CRL
-      Botan.Bindings.X509.CSR
-      Botan.Bindings.X509.DN
-      Botan.Bindings.X509.Extensions
-      Botan.Bindings.X509.Options
-      Botan.Bindings.X509.Path
-      Botan.Bindings.X509.Store
-
-    cpp-options:     -DXFFI