crypto/sha3-buffer: Add tests. * modules/crypto/sha3-buffer-tests: New file. * tests/test-sha3-224-buffer.c: Likewise. * tests/test-sha3-256-buffer.c: Likewise. * tests/test-sha3-384-buffer.c: Likewise. * tests/test-sha3-512-buffer.c: Likewise. * tests/bench-sha3-224.c: Likewise. * tests/bench-sha3-256.c: Likewise. * tests/bench-sha3-384.c: Likewise. * tests/bench-sha3-512.c: Likewise.