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/getcopyright.c

@@ -0,0 +1,23 @@
+/* Return the copyright string.  This is updated manually. */
+
+#include "Python.h"
+
+static char cprt[] = 
+"\
+Copyright (c) 2001-2020 Python Software Foundation.\n\
+All Rights Reserved.\n\
+\n\
+Copyright (c) 2000 BeOpen.com.\n\
+All Rights Reserved.\n\
+\n\
+Copyright (c) 1995-2001 Corporation for National Research Initiatives.\n\
+All Rights Reserved.\n\
+\n\
+Copyright (c) 1991-1995 Stichting Mathematisch Centrum, Amsterdam.\n\
+All Rights Reserved.";
+
+const char *
+Py_GetCopyright(void)
+{
+	return cprt;
+}