src: Check libvirt_admin.syms for exported symbols
src: Check libvirt_admin.syms for exported symbols

We have this check rule in src/Makefile: check-symfile that
should check if all symbols we wanted to export are exported.
Moreover, if we are not exporting something more. Do the same
with libvirt_admin.syms.

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

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