Drop nanobind workaround

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 iree-org#19591

Author: marbre

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}")