Bug#1105872: r-cran-lbfgsb3c: Correct L-BFGS-B's copyright

[Bastian Germann]

Source: r-cran-lbfgsb3c
Version: 2024-3.5-1
Severity: normal

Please correct the copyright info on the stanza
Files: src/blas.f
       src/lbfgsb.f
       src/timer.f

The files do not inherit the copyright from this project but from
L-BFGS-B, e.g. available at https://github.com/funsim/lbfgsb

When you replace the Copyright, please also copy the full license text
instead of refering to the file /usr/share/common-licenses/BSD.