tests: Run virmacmaptest iff WITH_YAJL
tests: Run virmacmaptest iff WITH_YAJL

Since the internal implementation relies on a json parser being
available, it make no sense to run this test if there's none
available.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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