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/Modules/sgimodule.c

@@ -0,0 +1,55 @@
+
+/* SGI module -- random SGI-specific things */
+
+#include "Python.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+static PyObject *
+sgi_nap(PyObject *self, PyObject *args)
+{
+    long ticks;
+    if (!PyArg_ParseTuple(args, "l:nap", &ticks))
+        return NULL;
+    Py_BEGIN_ALLOW_THREADS
+    sginap(ticks);
+    Py_END_ALLOW_THREADS
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+extern char *_getpty(int *, int, mode_t, int);
+
+static PyObject *
+sgi__getpty(PyObject *self, PyObject *args)
+{
+    int oflag;
+    int mode;
+    int nofork;
+    char *name;
+    int fildes;
+    if (!PyArg_ParseTuple(args, "iii:_getpty", &oflag, &mode, &nofork))
+        return NULL;
+    errno = 0;
+    name = _getpty(&fildes, oflag, (mode_t)mode, nofork);
+    if (name == NULL) {
+        PyErr_SetFromErrno(PyExc_IOError);
+        return NULL;
+    }
+    return Py_BuildValue("(si)", name, fildes);
+}
+
+static PyMethodDef sgi_methods[] = {
+    {"nap",             sgi_nap,        METH_VARARGS},
+    {"_getpty",         sgi__getpty,    METH_VARARGS},
+    {NULL,              NULL}           /* sentinel */
+};
+
+
+void
+initsgi(void)
+{
+    Py_InitModule("sgi", sgi_methods);
+}