[C2hs] other c2hs patches

Duncan, thanks for all your help recently. I've got another question that depends a bit on the recent patch I submitted. The file Config.hs defines a value for cppopts that is something like "-x c", varying on the platform. If cpp is called using runProcess, then (at least on Windows), those need to be passed as separate arguments (i.e. ["-x", "c"]) in order for cpp to understand them. Although it's a pretty simple change, is this true for other platforms (e.g. Linux) as well? Thanks, John