[codegen] undeclared identifier: 'BITMAPINFOHEADER'
* same example as https://github.com/genotrance/nimterop/issues/71
* after applying https://github.com/genotrance/nimterop/pull/73 I get a new error:
```
Error: undeclared identifier: 'BITMAPINFOHEADER'
```

```
/Users/timothee/git_clone/nim/timn/src/timn/nimterop/nimterop_issues.nim(4, 1) template/generic instantiation from here
/Users/timothee/git_clone/nim/timn/src/timn/nimterop/nimterop_issues.nim(8, 9) template/generic instantiation of `cImport` from here
/Users/timothee/git_clone/nim/Nim/lib/core/macros.nim(977, 55) Error: undeclared identifier: 'BITMAPINFOHEADER'
  proc newColonExpr*(a, b: NimNode): NimNode {.compileTime.} =
```


