util: virdaemon: fix compilation on mingw
util: virdaemon: fix compilation on mingw

The daemons are not supported on Win32 and therefore were not compiled
in that platform. However, with the daemon code sharing, all the code in
utils *is* compiled and it failed because `waitpid`, `fork`, and
`setsid` are not available. So, as before, let's not build them on
Win32 and make the code more portable by using existing vir* wrappers.

Signed-off-by: Rafael Fonseca <92b5eb2fd9104ba50cbd70c67dc2a52019d1ffde@gmail.com>
Reviewed-by: Marc-André Lureau <a6f2b960a4aca61381fc650a67901b2ac8e83e6d@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

jfehlig/libvirt,olafhering/libvirt,nertpinx/libvirt,zippy2/libvirt,fabianfreyer/libvirt,crobinso/libvirt,nertpinx/libvirt,libvirt/libvirt,jardasgit/libvirt,olafhering/libvirt,nertpinx/libvirt,nertpinx/libvirt,olafhering/libvirt,zippy2/libvirt,zippy2/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,crobinso/libvirt,jfehlig/libvirt,jfehlig/libvirt,libvirt/libvirt,jardasgit/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,libvirt/libvirt,zippy2/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,olafhering/libvirt,libvirt/libvirt,crobinso/libvirt,crobinso/libvirt,jardasgit/libvirt,jardasgit/libvirt