This update for virtualbox fixes the following issues:

- Package vboximg-mount correctly. boo#1200769.

- Explicitly BuildRequire pkgconfig(glx) and pkgconfig(glu): This
happened to be pulled in by SDL-devel, but with the switch to
sdl12-compat, this no longer happens. Virtualbox explicitly
checks for them though, so it is our own responsibility to have
those deps in place.

- Save and restore FPU status during interrupt. (boo#1199803)
- Replace SDL-devel BuildRequires with pkgconfig(sdl): allow to use
sdl12_compat as an alternative.