[codegen] Error: undeclared identifier: 'wchar_t'
```nim
import std/os
import nimterop/cimport

# replace this with path to include in your system
const incDir = getEnv("homebrew_D") # /Users/timothee/homebrew/

cDebug()
cAddSearchDir(incDir/"include")
cImport cSearchPath "FreeImage.h"
```

gives:

Error: undeclared identifier: 'wchar_t'
