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/Python/getversion.c

@@ -0,0 +1,15 @@
+
+/* Return the full version string. */
+
+#include "Python.h"
+
+#include "patchlevel.h"
+
+const char *
+Py_GetVersion(void)
+{
+	static char version[250];
+	PyOS_snprintf(version, sizeof(version), "%.80s (%.80s) %.80s",
+		      PY_VERSION, Py_GetBuildInfo(), Py_GetCompiler());
+	return version;
+}