[win64] Disable failing pythonizations test on Windows 64

On Windows 64, after removing the compiler flag workaround (PR root-project#9829), the `pythonizations` test is failing like:
```
1386: -- TEST COMMAND --
1386: cd C:/Users/sftnight/build/release/roottest/python/pythonizations
1386: C:/Python38/python.exe C:/Users/sftnight/git/roottest/python/pythonizations/PyROOT_pythonizationtest.py --fixcling
1386: -- BEGIN TEST OUTPUT --
1386: ============================= test session starts =============================
1386: platform win32 -- Python 3.8.10, pytest-6.2.5, py-1.11.0, pluggy-1.0.0
1386: rootdir: C:\Users\sftnight
1386: collected 7 items
1386:
1386: ..\..\..\..\..\git\roottest\python\pythonizations\PyROOT_pythonizationtest.py . [ 14%]
1386: .....Windows fatal exception: access violation
1386:
```

Author: bellenot

python/pythonizations/CMakeLists.txt

@@ -1,9 +1,11 @@
 if(ROOT_pyroot_FOUND)
-  ROOTTEST_ADD_TEST(pythonizations
-                    MACRO PyROOT_pythonizationtest.py
-                    COPY_TO_BUILDDIR Pythonizables.C Pythonizables.h
-                    PRECMD ${ROOT_root_CMD} -b -q -l -e .L\ Pythonizables.C+
-                    ENVIRONMENT LEGACY_PYROOT=${legacy_pyroot})
+  if(NOT MSVC OR "${CMAKE_GENERATOR_PLATFORM}" MATCHES "Win32" OR win_broken_tests)
+    ROOTTEST_ADD_TEST(pythonizations
+                      MACRO PyROOT_pythonizationtest.py
+                      COPY_TO_BUILDDIR Pythonizables.C Pythonizables.h
+                      PRECMD ${ROOT_root_CMD} -b -q -l -e .L\ Pythonizables.C+
+                      ENVIRONMENT LEGACY_PYROOT=${legacy_pyroot})
+  endif()
 
   ROOTTEST_ADD_TEST(smartptr
                     MACRO PyROOT_smartptrtest.py