cln: switch to cmake build_system and fix 1.3.7 build

[prudhomm]

Summary

cln uses currrently autotools as build_system, cmake is now the new build system and cln 1.3.7 builds properly with it which is not the case with autotools

Rationale

it is related to the fact that cln 1.3.7 does not build with autotools using spack

Description

the solution is to support cmake build_system starting from a few version back

Additional information

No response

General information

• I have searched the issues of this repo and believe this is not a duplicate