Fix HMAC DRBG compatibility with NVCC

Author: mborland

include/boost/crypt/utility/config.hpp

@@ -127,7 +127,7 @@
 // ----- Has something -----
 
 // ----- Unreachable -----
-#if defined(__GNUC__) || defined(__clang__)
+#if defined(__GNUC__) || defined(__clang__) || defined(BOOST_CRYPT_HAS_CUDA)
 #  define BOOST_CRYPT_UNREACHABLE __builtin_unreachable()
 #elif defined(_MSC_VER)
 #  define BOOST_CRYPT_UNREACHABLE __assume(0)

include/boost/crypt2/drbg/detail/hmac_drbg.hpp

@@ -135,7 +135,7 @@ BOOST_CRYPT_GPU_ENABLED_CONSTEXPR auto hmac_drbg<HMACType, max_hasher_security,
     const auto provided_data_size {provided_data_1.size() + provided_data_2.size() + provided_data_3.size()};
 
     // Step 1: V || 0x00 || provided data
-    compat::array<compat::byte, 1U> storage_gap {std::byte{0x00}};
+    compat::array<compat::byte, 1U> storage_gap {compat::byte{0x00}};
     compat::span<const compat::byte, 1U> storage_gap_span {storage_gap};
 
     HMACType hmac;