cabinet: Include wine/port.h for strcasecmp().

[Kirill K. Smirnov]

> The rules are as follows:
> - For case insensitive comparisons of 'windows strings', a Windows 
> function must be used (stricmp() or similar).

and
> In this case, KERNEL32 lstrcmpiA() would be more appropriate. In
> general, using stricmp() in Win32 code should be discouraged since it
> may cause unnecessary dependency on MSVCRT.

Wine lstrcmpi is broken (bug #10767). There are cases GLIBC strcasecmp and 
Windows lstrcmpi handle correctly but wine not. Should we fix this first?

--
Kirill