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/Parser/bitset.c

@@ -0,0 +1,66 @@
+
+/* Bitset primitives used by the parser generator */
+
+#include "pgenheaders.h"
+#include "bitset.h"
+
+bitset
+newbitset(int nbits)
+{
+    int nbytes = NBYTES(nbits);
+    bitset ss = (char *)PyObject_MALLOC(sizeof(BYTE) *  nbytes);
+
+    if (ss == NULL)
+        Py_FatalError("no mem for bitset");
+
+    ss += nbytes;
+    while (--nbytes >= 0)
+        *--ss = 0;
+    return ss;
+}
+
+void
+delbitset(bitset ss)
+{
+    PyObject_FREE(ss);
+}
+
+int
+addbit(bitset ss, int ibit)
+{
+    int ibyte = BIT2BYTE(ibit);
+    BYTE mask = BIT2MASK(ibit);
+
+    if (ss[ibyte] & mask)
+        return 0; /* Bit already set */
+    ss[ibyte] |= mask;
+    return 1;
+}
+
+#if 0 /* Now a macro */
+int
+testbit(bitset ss, int ibit)
+{
+    return (ss[BIT2BYTE(ibit)] & BIT2MASK(ibit)) != 0;
+}
+#endif
+
+int
+samebitset(bitset ss1, bitset ss2, int nbits)
+{
+    int i;
+
+    for (i = NBYTES(nbits); --i >= 0; )
+        if (*ss1++ != *ss2++)
+            return 0;
+    return 1;
+}
+
+void
+mergebitset(bitset ss1, bitset ss2, int nbits)
+{
+    int i;
+
+    for (i = NBYTES(nbits); --i >= 0; )
+        *ss1++ |= *ss2++;
+}