[PATCH] [PUSHED] Windows lcms2 library import fix

[Tor Lillqvist]

So should the CMS_DLL thing in the patch be done just for MSVC then?
Or would it be cleaner to just patch out the use of stdcall completely
instead? We don't promise that our build of the lsmc2 dll would be
binary compatible with anybody else's build of it, do we? (Which is
why we should use a more unique name for it, of course... to avoid
clashes with potential other installations of a lcms2.dll with
different API or ABI.)

--tml