qemuargv2xmltest: Fix caps loading in VPATH build
qemuargv2xmltest: Fix caps loading in VPATH build

Broken by v4.7.0-rc1-9-g6700062fb0.

Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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