Functions in core.sys.windows.imagehlp should be marked @nogc nothrow

## Jack Stouffer (@JackStouffer) reported this on 2023-02-26T06:37:18Z

### Transferred from https://issues.dlang.org/show_bug.cgi?id=23742

### Description

````markdown
The functions in core.sys.windows.imagehlp are Win32 functions and do not allocate gc memory or throw exceptions.
````