Fix -Werror=format-truncation= based on:

microsoft#1462

Author: a36233

Release/src/http/common/http_helpers.cpp

@@ -88,7 +88,8 @@ size_t chunked_encoding::add_chunked_delimiters(_Out_writes_(buffer_size) uint8_
 #ifdef _WIN32
         sprintf_s(buffer, sizeof(buffer), "%8IX", bytes_read);
 #else
-        snprintf(buffer, sizeof(buffer), "%8zX", bytes_read);
+        //snprintf(buffer, sizeof(buffer), "%8zX", bytes_read);
+        snprintf(buffer, sizeof(buffer), "%8X", static_cast<std::uint32_t>(bytes_read));
 #endif
         memcpy(&data[0], buffer, 8);
         while (data[offset] == ' ')