Warning
```dwg.h:9690:4: warning: ISO C99 doesn’t support unnamed structs/unions [-Wpedantic]```

Code:
```
  union {
    Dwg_R2004_Header r2004_header; /* encrypted, packed */
    Dwg_R2007_Header r2007_file_header; /* encrypted, packed */
  };
```
Warning with compilation - unnamed structs/unions
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : Warning with compilation - unnamed structs/unions
Issue date:

--- start body ---
Warning
```dwg.h:9690:4: warning: ISO C99 doesn’t support unnamed structs/unions [-Wpedantic]```

Code:
```
  union {
    Dwg_R2004_Header r2004_header; /* encrypted, packed */
    Dwg_R2007_Header r2007_file_header; /* encrypted, packed */
  };
```
--- end body ---
