[3/4] gdiplus: Load EMF images directly instead of through olepicture.

[Vincent Povirk]

> This patch is very incomplete, and probably won't pass the 'make test'.

It did for me, but that's not saying much. The current IPicture-based
loading is quite broken.

> wine-staging contains a pretty full and well tested patch that reimplements
> metafile loading in gdiplus using gdi32 APis:
> https://github.com/wine-compholio/wine-staging/blob/master/patches/oleaut32-OLEPictureImpl_SaveAsFile/0001-gdiplus-Reimplement-metafile-loading-using-gdi32-ins.patch
> it should be possible to either use it directly or as a base for your work.
> There are some other related patches in staging that touch the metafile
> loading in gdiplus.

Yes, that looks better than my version of emf loading. Would you be
willing to send it to wine-patches?