test upcoming smart holder squish branch

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "robotpy_build/pybind11"]
 	path = robotpy_build/pybind11
-	url = https://github.com/pybind/pybind11.git
+	url = https://github.com/rwgk/pybind11

robotpy_build/autowrap/render_pybind11.py

@@ -338,6 +338,8 @@ def cls_decl(r: RenderBuffer, cls: ClassContext):
         class_params.append(
             f"std::unique_ptr<typename {cls.full_cpp_name}, py::nodelete>"
         )
+    else:
+        class_params.append("py::smart_holder")
 
     if cls.trampoline:
         class_params.append(cls.trampoline.var)

robotpy_build/command/build_ext.py

@@ -134,7 +134,6 @@ def _spawn(cmd):
                 self.compiler._rpy_spawn = self.compiler.spawn
                 self.compiler.spawn = _spawn
         for ext in self.extensions:
-            ext.define_macros.append(("PYBIND11_USE_SMART_HOLDER_AS_DEFAULT", "1"))
             if debug:
                 ext.define_macros.append(
                     ("PYBIND11_ASSERT_GIL_HELD_INCREF_DECREF", "1")