Silence three tests following PR #1413

[eddelbuettel]

This is a minor 'quality of life' improvement to silence three tests that assert that the (old, unused) helpers for compiler and linker flags do the Right Thing (TM) and return nothing, but following #1413 emit a message. Which we now suppress.

When these get deprecated / warn we will change the tests or possibly add tests for warnings.

Checklist

• Code compiles correctly
• R CMD check still passes all tests
• Preferably, new tests were added which fail without the change
• Document the changes by file in ChangeLog

[Copilot]

Pull request overview

This PR silences informational messages emitted by three deprecated helper functions (RcppLdPath, RcppLdFlags, LdFlags) during test execution. These functions have been obsolete since 2013 and now emit messages following PR #1413, but the tests still verify they return the correct empty values.

• Wraps three test function calls with suppressMessages() to prevent output noise
• Updates copyright year in the test file from 2019 to 2025
• Documents the changes in the ChangeLog

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
inst/tinytest/test_system.R	Adds suppressMessages() around three obsolete linker/compiler flag function calls and updates copyright year
ChangeLog	Documents the test silencing changes with proper date and description

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