Further fix the too-old-libtool error message
Further fix the too-old-libtool error message

This is a m4 check so it has to be evaluated anyway, so we have
to put it outside of the HWLOC_INIT m4 function.
Otherwise, the check does nothing.

This commit was SVN r1743.

ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,ggouaillardet/hwloc,shekkbuilder/hwloc,shekkbuilder/hwloc