domsuspend: Fix warning on mingw build
domsuspend: Fix warning on mingw build

Commit d82170d introduced a workaround for domtop: in that example
program, we define a symbol called ERROR for our own use, but since
a symbol with the same name is already defined in one of mingw's
header files, we get a warning when using that compiler.

domsuspend defines the same problematic symbol, so the workaround
has been copied over.

eskultety/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,jfehlig/libvirt,datto/libvirt,jardasgit/libvirt,taget/libvirt,eskultety/libvirt,jardasgit/libvirt,libvirt/libvirt,datto/libvirt,eskultety/libvirt,jardasgit/libvirt,libvirt/libvirt,datto/libvirt,datto/libvirt,crobinso/libvirt,eskultety/libvirt,taget/libvirt,zippy2/libvirt,olafhering/libvirt,VenkatDatta/libvirt,zippy2/libvirt,nertpinx/libvirt,eskultety/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,taget/libvirt,crobinso/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,taget/libvirt,libvirt/libvirt,zippy2/libvirt,olafhering/libvirt,datto/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,taget/libvirt,jfehlig/libvirt,jfehlig/libvirt,zippy2/libvirt,olafhering/libvirt,andreabolognani/libvirt,nertpinx/libvirt,nertpinx/libvirt,nertpinx/libvirt,libvirt/libvirt,jardasgit/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,crobinso/libvirt,crobinso/libvirt,olafhering/libvirt,jardasgit/libvirt,andreabolognani/libvirt