cmDyndepCollation: Don't serialize local arguments

LocalArguments as implemented in commit ce309f8885 (cmDyndepCollation:
Cxx module manifest format, 2026-01-22) carries dependency assumptions
which break when the resulting install tree is relocated or reused in an
different build environment. Module manifests are ill-equipped to solve
this problem. For now, forego local arguments entirely rather than
encode potentially bogus information.

Issue: #27565