docs(build): filter checklink's Perl noise in checkref#4108
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w3c-linkchecker prints "Use of uninitialized value ... checklink line N" to stderr on some inputs; it is tool noise, not link results, and floods the build/CI log. Drop those lines; checklink stays first in the pipe so PIPESTATUS[0] is unchanged.
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Now that link checking actually runs (#4104), the build and CI logs are flooded with Perl warnings from
linuxcnc-checklink(w3c-linkchecker) itself:These come from the W3C tool, not from any of our links, so they add only noise. Reported by @hansu on the #4081 CI run.
This drops those lines from the output
checkrefcaptures and prints.linuxcnc-checklinkstays first in the pipe, soPIPESTATUS[0](checked right after to distinguish "could not validate" from "found broken links") is unchanged, and theAccess to 'file' URIs has been disabledsentinel thatcheckrefgreps for is preserved.One-line change, no behavior change beyond suppressing the noise.