Remove unnecessary use of non-portable 'mkdir()'

[Dirk Hohndel]

On Sun, Feb 15, 2015 at 10:09:19PM +0200, Lubomir I. Ivanov wrote:
> >
> > Actual tested (now that I got it to build) patch attached.
> 
> i guess we can still keep the wrapper i wrote since - if my memory
> serves me correctly this is the second time(?) mkdir usage pops out.
> 
> [PATCH 2/5] OS: add the subsurface_mkdir() wrapper
> it will probably conflict with this patch though, so let me know if i
> have to fix mine.
> 
> ...or just discard the wrapper addition for now, which is fine.

That's what I did since I didn't see any other use of mkdir from C code
(we use Qt's mkdir method elsewhere).

All the patches have been pushed.

Now all that's missing is the code to make my Windows and Mac builds work
again...

/D