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/cryptopp/adhoc.cpp

@@ -0,0 +1,42 @@
+#include "config.h"
+#include <iosfwd>
+#include <string>
+
+#if CRYPTOPP_MSC_VERSION
+# pragma warning(disable: 4100 4189 4996)
+#endif
+
+#if CRYPTOPP_GCC_DIAGNOSTIC_AVAILABLE
+# pragma GCC diagnostic ignored "-Wunused-variable"
+#endif
+
+USING_NAMESPACE(CryptoPP)
+USING_NAMESPACE(std)
+
+#ifndef CRYPTOPP_UNUSED
+# define CRYPTOPP_UNUSED(x) (void(x))
+#endif
+
+// Used for testing the compiler and linker in cryptest.sh
+#if defined(CRYPTOPP_ADHOC_MAIN) || defined(ADHOC_MAIN)
+
+int main(int argc, char *argv[])
+{
+	CRYPTOPP_UNUSED(argc), CRYPTOPP_UNUSED(argv);
+	return 0;
+}
+
+// Classic use of adhoc to setup calling convention
+#else
+
+extern int (*AdhocTest)(int argc, char *argv[]);
+
+int MyAdhocTest(int argc, char *argv[])
+{
+	CRYPTOPP_UNUSED(argc), CRYPTOPP_UNUSED(argv);
+	return 0;
+}
+
+static int s_i = (AdhocTest = &MyAdhocTest, 0);
+
+#endif