Drop nanobind workaround (#19912)

This drops the workaround to set linker flags to work around the issue
when building the compiler Python bindings for macOS as this is fixed
upstream as soon as llvm/llvm-project#125733 lands and was integrated
into IREE's llvm fork.

Closes #19591

CMakeLists.txt

@@ -649,11 +649,6 @@ if(IREE_BUILD_PYTHON_BINDINGS)
   # can be troublesome. Note that nanobind requires FindPython.
   set(Python_EXECUTABLE "${Python3_EXECUTABLE}")
   find_package(Python 3.9 COMPONENTS Interpreter Development.Module NumPy REQUIRED)
-  if(APPLE)
-    # Workaround for upstream using PyClassMethod_New but nanobind not being aware
-    # see https://github.com/iree-org/iree/issues/19591
-    set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-U -Wl,_PyClassMethod_New")
-  endif()
 elseif(IREE_BUILD_COMPILER OR IREE_BUILD_TESTS)
   find_package(Python3 COMPONENTS Interpreter REQUIRED)
   set(Python_EXECUTABLE "${Python3_EXECUTABLE}")