remove hack for debian etch limits.h
remove hack for debian etch limits.h

The debian etch distro was end-of-life a long time ago so we no
longer need the ULLONG_MAX hack. In any case gnulib now provides
an equivalent fix by default, and so our definition now triggers
syntax-check rule failure

src/internal.h:#    define ULLONG_MAX   ULONG_LONG_MAX
maint.mk: define the above via some gnulib .h file
maint.mk:843: recipe for target 'sc_prohibit_always-defined_macros' failed

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

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