bpo-36635: Change pyport.h for Py_BUILD_CORE_MODULE define (GH-12853)

Change PyAPI_FUNC(type), PyAPI_DATA(type) and PyMODINIT_FUNC macros
of pyport.h when Py_BUILD_CORE_MODULE is defined.

The Py_BUILD_CORE_MODULE define must be now be used to build a C
extension as a dynamic library accessing Python internals: export the
PyInit_xxx() function in DLL exports on Windows.

Changes:

* Py_BUILD_CORE_BUILTIN and Py_BUILD_CORE_MODULE now imply
  Py_BUILD_CORE directy in pyport.h.
* ceval.c compilation now fails with an error if Py_BUILD_CORE is not
  defined, just to ensure that Python is build with the correct
  defines.
* setup.py now compiles _pickle.c with Py_BUILD_CORE_MODULE define.
* setup.py compiles _json.c with Py_BUILD_CORE_MODULE define, rather
  than Py_BUILD_CORE_BUILTIN define
* PCbuild/pythoncore.vcxproj: Add Py_BUILD_CORE_BUILTIN define.

Python/ceval.c

@@ -30,6 +30,10 @@
 #define CHECKEXC 1      /* Double-check exception checking */
 #endif
 
+#if !defined(Py_BUILD_CORE)
+#  error "ceval.c must be build with Py_BUILD_CORE define for best performance"
+#endif
+
 /* Private API for the LOAD_METHOD opcode. */
 extern int _PyObject_GetMethod(PyObject *, PyObject *, PyObject **);