[fix] add missing latexmk package to debian's BUILD_PACKAGES

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

utils/searx.sh

@@ -49,7 +49,8 @@ shellcheck"
 
 BUILD_PACKAGES_debian="\
 firefox graphviz imagemagick texlive-xetex librsvg2-bin
-texlive-latex-recommended texlive-extra-utils ttf-dejavu"
+texlive-latex-recommended texlive-extra-utils ttf-dejavu
+latexmk"
 
 # pacman packages
 SEARX_PACKAGES_arch="\