* add WC_RNG_BANK_STATIC to WC_RNG_BANK_SUPPORT, supporting WOLFSSL_NO_MALLOC;
* in random_bank_test(), fix gate around _NO_VECTOR_OPS sha256.sha_method test (WOLFSSL_SMALL_STACK_CACHE, and USE_INTEL_SPEEDUP not WC_HAVE_VECTOR_SPEEDUPS);
* in definition of struct wc_rng_bank_inst, accommodate WOLFSSL_NO_ATOMICS builds;
wolfssl/wolfcrypt/random.h: in definition of struct WC_RNG, add gate to avoid empty union in !HAVE_HASHDRBG configs.