use FindBin instead of awk to find the path to utils.pm (#1241)

[Evgeni Golov]

Thinking further, the following can now be removed from `subst.in`:

    # add to libexecdir to INC for perl utils.pm
    /^use/ { if (/lib/) { if (/utils.pm|"."/ ) {sub(/utils.pm|"."/,led() )} } }

Removing this would stop new contributions from accidentally using it again.

The whole `led()` function could be then removed too.

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