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/Lib/md5.py

@@ -0,0 +1,14 @@
+# $Id$
+#
+#  Copyright (C) 2005   Gregory P. Smith (greg@krypto.org)
+#  Licensed to PSF under a Contributor Agreement.
+
+import warnings
+warnings.warn("the md5 module is deprecated; use hashlib instead",
+                DeprecationWarning, 2)
+
+from hashlib import md5
+new = md5
+
+blocksize = 1        # legacy value (wrong in any useful sense)
+digest_size = 16