python3: Fix cross compilation to FreeBSD

- autoreconf needs to be run if we patch configure.ac
- the patch lines need to be adjusted otherwise it applies wrong

pkgs/development/interpreters/python/cpython/default.nix

@@ -208,10 +208,16 @@ let
   nativeBuildInputs = [
     nukeReferences
   ]
-  ++ optionals (!stdenv.hostPlatform.isDarwin && !withMinimalDeps) [
-    autoconf-archive # needed for AX_CHECK_COMPILE_FLAG
-    autoreconfHook
-  ]
+  ++
+    optionals
+      (
+        (!stdenv.hostPlatform.isDarwin && !withMinimalDeps)
+        || (stdenv.hostPlatform != stdenv.buildPlatform && stdenv.hostPlatform.isFreeBSD)
+      )
+      [
+        autoconf-archive # needed for AX_CHECK_COMPILE_FLAG
+        autoreconfHook
+      ]
   ++
     optionals ((!stdenv.hostPlatform.isDarwin || passthru.pythonAtLeast "3.14") && !withMinimalDeps)
       [

pkgs/development/interpreters/python/cpython/freebsd-cross.patch

@@ -1,6 +1,6 @@
 --- a/configure.ac	2024-06-07 09:17:50.608162031 -0700
 +++ b/configure.ac	2024-06-07 09:45:59.844518241 -0700
-@@ -554,6 +554,9 @@
+@@ -339,6 +339,9 @@
  	*-*-wasi)
  	    ac_sys_system=WASI
  	    ;;
@@ -10,7 +10,7 @@
  	*)
  		# for now, limit cross builds to known configurations
  		MACHDEP="unknown"
-@@ -614,6 +617,9 @@
+@@ -780,6 +783,9 @@
  	wasm32-*-* | wasm64-*-*)
  		_host_cpu=$host_cpu
  		;;