external/python33: adapt to -Werror,-Wundef being enabled for clang-cl

Change-Id: I82bedca98ed5ec22b434c7b25c87bf5d77e7ed21

external/python33/UnpackedTarball_python3.mk

@@ -35,6 +35,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,python3,\
 	external/python33/python-msvc-disable-sse2.patch.1 \
 	external/python33/python-lsan.patch.0 \
 	external/python33/ubsan.patch.0 \
+	external/python33/clang-cl.patch.0 \
 ))
 
 ifneq ($(filter DRAGONFLY FREEBSD LINUX NETBSD OPENBSD SOLARIS,$(OS)),)

external/python33/clang-cl.patch.0

+--- Include/pyport.h
++++ Include/pyport.h
+@@ -219,7 +219,7 @@
+ /* Smallest negative value of type Py_ssize_t. */
+ #define PY_SSIZE_T_MIN (-PY_SSIZE_T_MAX-1)
+ 
+-#if SIZEOF_PID_T > SIZEOF_LONG
++#if defined SIZEOF_PID_T && SIZEOF_PID_T > SIZEOF_LONG
+ #   error "Python doesn't support sizeof(pid_t) > sizeof(long)"
+ #endif
+