RISC-V: Added vector and hardware AES support

[SChernykh]

Vector and AES extensions are detected and used in runtime, even in rv64gc builds, because they are crucial for performance.

[SChernykh]

@hyc @tevador please review

[SChernykh]

@tevador @hyc please review

[hyc]

Looks good to me. Lichee Pi 4a

debian@lpi4a:~/RandomX/build$ ./randomx-benchmark --mine --auto --threads 4  --largePages
RandomX benchmark v1.2.1
 - Argon2 implementation: reference
 - full memory mode (2080 MiB)
 - JIT compiled mode 
 - software AES mode
 - large pages mode
 - batch mode
Initializing (4 threads) ...
Memory initialized in 29.9412 s
Initializing 4 virtual machine(s) ...
Running benchmark (1000 nonces) ...
Calculated result: 10b649a3f15c7c7f88277812f2e74b337a0f20ce909af09199cccb960771cfa1
Reference result:  10b649a3f15c7c7f88277812f2e74b337a0f20ce909af09199cccb960771cfa1
Performance: 132.342 hashes per second
debian@lpi4a:~/RandomX/build$ ./randomx-benchmark --mine --auto --threads 4  --largePages --v2
RandomX benchmark v1.2.1
 - Argon2 implementation: reference
 - full memory mode (2080 MiB)
 - JIT compiled mode 
 - software AES mode
 - large pages mode
 - batch mode
Initializing (4 threads) ...
Memory initialized in 29.9764 s
Initializing 4 virtual machine(s) ...
Running benchmark (1000 nonces) ...
Calculated result: c9e7466cb44a37e78ad21415c73ef21075bca75a0b8c28ec439a16df0b5c21cd
Reference result:  c9e7466cb44a37e78ad21415c73ef21075bca75a0b8c28ec439a16df0b5c21cd
Performance: 89.7117 hashes per second

Built with gcc 14.3.0, gas (binutils) 2.45