BUG: sparse/arpack: build with second_NONE

Arpack doesn't need the timing routine for anything.  arpack-ng also
builds using second_NONE
BUG: optimize: stub out lbfgsb timer

Also the L-BFGS-B code doesn't really need to know the timings,
as they are not exposed by scipy.
Merge pull request #2949 from pv/arscnd

Stub out timer routines in Fortran code