util: Simplify Windows version of virGetUserDirectoryByUID()
util: Simplify Windows version of virGetUserDirectoryByUID()

Let's just use the plain g_get_home_dir(), from GLib, instead of
maintaining a code adapted from the GLib's one.

Signed-off-by: Fabiano Fidêncio <2931bae082ef9bc04523ba759c03a4778316d48f@redhat.com>
Reviewed-by: Cole Robinson <7cd45ff6ad1fb7cf556a02797d774247851499f8@redhat.com>

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