[Python-modules-team] Bug#778635: L-BFGS-B now in Debian

[Gard Spreemann]

The L-BFGS-B library in question is now in Debian as liblbfgsb0 and
liblbfgsb-dev.

Removing the relevant source files from scipy/optimize/setup.py and
adding lbfgsb to the list of libraries to link to seems to work fine,
and the relevant tests still pass. I did

 -    sources = ['lbfgsb.pyf', 'lbfgsb.f', 'linpack.f', 'timer.f']
 +    sources = ['lbfgsb.pyf']
 +    libs = lapack.setdefault('libraries', [])
 +    libs.append('lbfgsb')
 +    lapack['libraries'] = libs

which obviously is confusing name-wise, but works.

With this change, one gets rid of an embedded copy of both lbfgsb and
Linpack.

See also #811069.



 Best,
 Gard