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/ttmac.h

@@ -0,0 +1,44 @@
+// ttmac.h - written and placed in the public domain by Kevin Springle
+
+/// \file ttmac.h
+/// \brief Classes for the TTMAC message authentication code
+
+#ifndef CRYPTOPP_TTMAC_H
+#define CRYPTOPP_TTMAC_H
+
+#include "seckey.h"
+#include "iterhash.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief TTMAC message authentication code information
+class CRYPTOPP_NO_VTABLE TTMAC_Base : public FixedKeyLength<20>, public IteratedHash<word32, LittleEndian, 64, MessageAuthenticationCode>
+{
+public:
+	static std::string StaticAlgorithmName() {return std::string("Two-Track-MAC");}
+	CRYPTOPP_CONSTANT(DIGESTSIZE=20);
+
+	unsigned int DigestSize() const {return DIGESTSIZE;};
+	void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &params);
+	void TruncatedFinal(byte *mac, size_t size);
+
+protected:
+	static void Transform (word32 *digest, const word32 *X, bool last);
+	void HashEndianCorrectedBlock(const word32 *data) {Transform(m_digest, data, false);}
+	void Init();
+	word32* StateBuf() {return m_digest;}
+
+	FixedSizeSecBlock<word32, 10> m_digest;
+	FixedSizeSecBlock<word32, 5> m_key;
+};
+
+/// \brief Two-Track-MAC message authentication code
+/// \tparam T HashTransformation class
+/// \details 160-bit MAC with 160-bit key
+/// \sa MessageAuthenticationCode(), <a href="http://www.weidai.com/scan-mirror/mac.html#TTMAC">Two-Track-MAC</a>
+DOCUMENTED_TYPEDEF(MessageAuthenticationCodeFinal<TTMAC_Base>, TTMAC);
+
+NAMESPACE_END
+
+#endif