riched20: EM_GETLINE implementation and test

[Andrew Talbot]

Marcus Meissner wrote:
> In Linux, L"" makes 4 byte character strings (if not using explicit
> -fshort-wchar). Also, if the user then calls wc* functions from glibc,
> they will use 4 byte characters.
> 
> It is all to avoid confusion.
> 
> Ciao, Marcus

Interestingly, it looks like, in one standard version of C, at least - maybe
not C89 - there is now a pair of utf16 string-literal constructs: u'x' an
u"string". But that's another story.

Thanks, Marcus (and Mike)!

-- Andy.