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/aes_armv4.h

@@ -0,0 +1,30 @@
+/* Header file for use with Cryptogam's ARMv4 AES.         */
+/* Also see http://www.openssl.org/~appro/cryptogams/ and  */
+/* https://wiki.openssl.org/index.php?title=Cryptogams_AES */
+
+#ifndef CRYPTOGAMS_AES_ARMV4_H
+#define CRYPTOGAMS_AES_ARMV4_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//#define AES_MAXNR 14
+//typedef struct AES_KEY_st {
+//    unsigned int rd_key[4 * (AES_MAXNR + 1)];
+//    int rounds;
+//} AES_KEY;
+
+// Instead of AES_KEY we use a 'word32 rkey[4*15+4]'. It has space for
+// both the AES_MAXNR round keys and the number of rounds in the tail.
+
+int cryptogams_AES_set_encrypt_key(const unsigned char *userKey, const int bits, unsigned int *rkey);
+int cryptogams_AES_set_decrypt_key(const unsigned char *userKey, const int bits, unsigned int *rkey);
+void cryptogams_AES_encrypt_block(const unsigned char *in, unsigned char *out, const unsigned int *rkey);
+void cryptogams_AES_decrypt_block(const unsigned char *in, unsigned char *out, const unsigned int *rkey);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* CRYPTOGAMS_AES_ARMV4_H */