Fix dependency to the archived package limSolve

[pregnault]

The R package {limSolve} has been archived on CRAN on the 2nd of June, 2025. It makes part of imported packages in {samplelim}. This broken dependency has to be fixed.

[pregnault]

The function lim.redpol() in the script R/redpol.R depends on the function lsei() of {limSolve} which is implemented in Fortran. The Fortran source code (located in src/ of limSolve_1.5.7.2) should be integrated to {samplelim} in a way compatible with Rcpp.