layout: restructure into src/ tests/ android/ scripts/ tools/

- extension/src/{port,platform,codepage} -> src/; native_render -> src/host
  (+ dxt, shaders/); libgr2 -> src/gr2; extension/third_party -> third_party
- extension/tests -> tests/port, libgr2/tests -> tests/gr2
- android-native -> android (build.sh, push-client.sh moved in)
- script -> scripts; tools/40250 -> tools/server; oracle -> tools/granny-oracle;
  perf tools -> tools/perf
- all build trees under build/ (native, release, android, port-gate)
- xrender:: CMake aliases -> mt::; port-map ledger impl paths rewritten

No code changes. ctest 15/15, port_gate macos+android PASS, port_map check 0 errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

third_party/cpython-2.7.18/Include/bufferobject.h

@@ -0,0 +1,33 @@
+
+/* Buffer object interface */
+
+/* Note: the object's structure is private */
+
+#ifndef Py_BUFFEROBJECT_H
+#define Py_BUFFEROBJECT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+PyAPI_DATA(PyTypeObject) PyBuffer_Type;
+
+#define PyBuffer_Check(op) (Py_TYPE(op) == &PyBuffer_Type)
+
+#define Py_END_OF_BUFFER	(-1)
+
+PyAPI_FUNC(PyObject *) PyBuffer_FromObject(PyObject *base,
+                                           Py_ssize_t offset, Py_ssize_t size);
+PyAPI_FUNC(PyObject *) PyBuffer_FromReadWriteObject(PyObject *base,
+                                                    Py_ssize_t offset,
+                                                    Py_ssize_t size);
+
+PyAPI_FUNC(PyObject *) PyBuffer_FromMemory(void *ptr, Py_ssize_t size);
+PyAPI_FUNC(PyObject *) PyBuffer_FromReadWriteMemory(void *ptr, Py_ssize_t size);
+
+PyAPI_FUNC(PyObject *) PyBuffer_New(Py_ssize_t size);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_BUFFEROBJECT_H */