pypy: Stop the prebuilt interpreters depending on Tcl/Tk 8.5

`prebuilt.nix` (3.10, 3.11) asked for Tcl/Tk 8.5 on Linux, but the
`_tkinter` extension in those tarballs is linked against `libtcl8.6.so`
and `libtk8.6.so`. It resolved anyway, because the tarball vendors its own
copy of both under `lib/`. So the declared dependency was doing nothing,
and `tkinter` -- which is stdlib, not an optional extra -- was quietly
running against a bundled Tcl that we do not update.

Point it at our 8.6 instead, and delete the vendored libraries so it has
to. The vendored *script* libraries have to go too: `init.tcl` checks the
exact patchlevel, so our 8.6.16 rejects the bundled 8.6.14 copy as "not
usable" and `Tcl_Init` fails. Note that the existing `installCheckPhase`
does not catch that, as `import tkinter` never creates an interpreter;
`tkinter.Tcl()` does.

`prebuilt_2_7.nix` genuinely needs 8.5 -- its `tklib_cffi` asks for
`libtcl8.5.so` and its `installPhase` does not keep the bundled `lib/` --
but it exists only to bootstrap the source build of PyPy2, where nothing
imports `tkinter`. Let the module go unresolved and drop it from the
import check rather than keep an end-of-life Tcl alive for it.

Assisted-by: Claude Code (Claude Opus 5)

pkgs/development/interpreters/python/pypy/prebuilt.nix

@@ -11,8 +11,6 @@
   gdbm,
   ncurses6,
   sqlite,
-  tcl-8_5,
-  tk-8_5,
   tcl-8_6,
   tk-8_6,
   zlib,
@@ -83,12 +81,6 @@ stdenv.mkDerivation {
     sqlite
     zlib
     stdenv.cc.cc.libgcc or null
-  ]
-  ++ lib.optionals stdenv.hostPlatform.isLinux [
-    tcl-8_5
-    tk-8_5
-  ]
-  ++ lib.optionals stdenv.hostPlatform.isDarwin [
     tcl-8_6
     tk-8_6
   ];
@@ -102,10 +94,24 @@ stdenv.mkDerivation {
     echo "Moving files to $out"
     mv -t $out bin include lib
     mv $out/bin/libpypy*-c${stdenv.hostPlatform.extensions.sharedLibrary} $out/lib/
-    ${lib.optionalString stdenv.hostPlatform.isLinux ''
-      rm $out/bin/*.debug
-    ''}
-
+  ''
+  + lib.optionalString stdenv.hostPlatform.isLinux ''
+    rm $out/bin/*.debug
+  ''
+  # The tarball vendors Tcl/Tk. Drop it so `tkinter` -- which is stdlib, not an
+  # optional extra -- resolves against ours instead: the same 8.6 the extension
+  # module asks for by soname, but one that gets updated.
+  #
+  # The script libraries have to go with the shared ones. `init.tcl` checks the
+  # exact patchlevel, so our 8.6.16 rejects the bundled 8.6.14 copy as "not
+  # usable" and `Tcl_Init` fails -- which `import tkinter` alone does not
+  # catch, since that never creates an interpreter.
+  + lib.optionalString stdenv.hostPlatform.isLinux ''
+    rm $out/lib/libtcl8.6${stdenv.hostPlatform.extensions.sharedLibrary}
+    rm $out/lib/libtk8.6${stdenv.hostPlatform.extensions.sharedLibrary}
+    rm -r $out/lib/tcl8.6 $out/lib/tk8.6
+  ''
+  + ''
     echo "Removing bytecode"
     find . -name "__pycache__" -type d -depth -delete
 

pkgs/development/interpreters/python/pypy/prebuilt_2_7.nix

@@ -11,8 +11,6 @@
   gdbm,
   ncurses6,
   sqlite,
-  tcl-8_5,
-  tk-8_5,
   tcl-8_6,
   tk-8_6,
   zlib,
@@ -84,10 +82,6 @@ stdenv.mkDerivation {
     zlib
     stdenv.cc.cc.libgcc or null
   ]
-  ++ lib.optionals stdenv.hostPlatform.isLinux [
-    tcl-8_5
-    tk-8_5
-  ]
   ++ lib.optionals stdenv.hostPlatform.isDarwin [
     tcl-8_6
     tk-8_6
@@ -95,6 +89,15 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = lib.optionals stdenv.hostPlatform.isLinux [ autoPatchelfHook ];
 
+  # Only a bootstrap interpreter, so its `tkinter` is never imported. The
+  # tarball bundles the Tcl/Tk it wants but `installPhase` does not keep
+  # `lib/`, so rather than depend on a Tcl this old just to satisfy a module
+  # nobody loads, let the module stay unresolved.
+  autoPatchelfIgnoreMissingDeps = lib.optionals stdenv.hostPlatform.isLinux [
+    "libtcl8.5.so"
+    "libtk8.5.so"
+  ];
+
   installPhase = ''
     runHook preInstall
 
@@ -150,10 +153,12 @@ stdenv.mkDerivation {
         "sys"
         "curses"
       ]
-      ++ lib.optionals (!isPy3k) [
+      # Only Linux gives up on `tkinter`; Darwin still links it against a Tcl
+      # of ours in `preFixup`.
+      ++ lib.optionals (!isPy3k && !stdenv.hostPlatform.isLinux) [
         "Tkinter"
       ]
-      ++ lib.optionals isPy3k [
+      ++ lib.optionals (isPy3k && !stdenv.hostPlatform.isLinux) [
         "tkinter"
       ];
       imports = lib.concatMapStringsSep "; " (x: "import ${x}") modules;