Add some Windows-only C API funtions

Author: timfel

graalpython/com.oracle.graal.python.processor/src/com/oracle/graal/python/processor/CApiBuiltinsProcessor.java

@@ -748,6 +748,10 @@ private static Path resolvePath(Path path) {
                     "_PyCFunction_SetModule", "_PyCFunction_SetMethodDef",
                     "PyCode_GetFileName", "_PyArray_Resize", "_PyArray_Data",
                     "_PyErr_Occurred", "_PyNamespace_New", "_Py_GetErrorHandler",
+                    // Not actually additional, only defined on Windows.
+                    // TODO: fix generated CAPIFunctions.txt
+                    "PyUnicode_AsMBCSString", "PyUnicode_EncodeCodePage", "PyUnicode_DecodeMBCS",
+                    "PyUnicode_DecodeCodePageStateful", "PyUnicode_DecodeMBCSStateful",
     };
 
     public String resolveArgDescriptor(String sig) {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/cext/capi/CApiFunction.java

@@ -1238,6 +1238,12 @@ public final class CApiFunction {
     @CApiBuiltin(name = "_PyInterpreterState_HasFeature", ret = PrimitiveResult32, args = {PyInterpreterState, UNSIGNED_LONG}, call = CImpl)
     @CApiBuiltin(name = "_PyImport_AcquireLock", ret = Void, args = {PyInterpreterState}, call = NotImplemented)
     @CApiBuiltin(name = "_PyImport_ReleaseLock", ret = PrimitiveResult32, args = {PyInterpreterState}, call = NotImplemented)
+    // Windows only functions
+    @CApiBuiltin(name = "PyUnicode_DecodeMBCS", ret = PyObject, args = {ConstCharPtr, Py_ssize_t, ConstCharPtr}, call = NotImplemented)
+    @CApiBuiltin(name = "PyUnicode_DecodeMBCSStateful", ret = PyObject, args = {ConstCharPtr, Py_ssize_t, ConstCharPtr, PY_SSIZE_T_PTR}, call = NotImplemented)
+    @CApiBuiltin(name = "PyUnicode_DecodeCodePageStateful", ret = PyObject, args = {Int, ConstCharPtr, Py_ssize_t, ConstCharPtr, PY_SSIZE_T_PTR}, call = NotImplemented)
+    @CApiBuiltin(name = "PyUnicode_AsMBCSString", ret = PyObject, args = {PyObject}, call = NotImplemented)
+    @CApiBuiltin(name = "PyUnicode_EncodeCodePage", ret = PyObject, args = {Int, PyObject, ConstCharPtr}, call = NotImplemented)
 
     private static final class Dummy {
         // only here for the annotations