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/dircache.py

@@ -0,0 +1,41 @@
+"""Read and cache directory listings.
+
+The listdir() routine returns a sorted list of the files in a directory,
+using a cache to avoid reading the directory more often than necessary.
+The annotate() routine appends slashes to directories."""
+from warnings import warnpy3k
+warnpy3k("the dircache module has been removed in Python 3.0", stacklevel=2)
+del warnpy3k
+
+import os
+
+__all__ = ["listdir", "opendir", "annotate", "reset"]
+
+cache = {}
+
+def reset():
+    """Reset the cache completely."""
+    global cache
+    cache = {}
+
+def listdir(path):
+    """List directory contents, using cache."""
+    try:
+        cached_mtime, list = cache[path]
+        del cache[path]
+    except KeyError:
+        cached_mtime, list = -1, []
+    mtime = os.stat(path).st_mtime
+    if mtime != cached_mtime:
+        list = os.listdir(path)
+        list.sort()
+    cache[path] = mtime, list
+    return list
+
+opendir = listdir # XXX backward compatibility
+
+def annotate(head, list):
+    """Add '/' suffixes to directories."""
+    for i in range(len(list)):
+        if os.path.isdir(os.path.join(head, list[i])):
+            list[i] = list[i] + '/'