/usr/share/texmf/tex/latex/gnuplot/gnuplot-lua-tikz.tex is in gnuplot-qt 4.6.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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%% plain TeX wrapper for gnuplot-tikz style file
%%
\input tikz.tex
\usetikzlibrary{arrows,patterns,plotmarks,backgrounds}
\edef\tikzatcode{\the\catcode`\@}
\catcode`\@=11
\input gnuplot-lua-tikz-common.tex
\catcode`\@=\tikzatcode
\endinput
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