configure.ac: Use chk_mod.lua
configure.ac: Use chk_mod.lua

Check at configure-time whether the required Lua modules are
available. Skip this step if lua(1) is not found in the path.

Signed-off-by: Toni Gundogdu <eac2284b3c43676907b96f08de9d3d52d5df0361@gmail.com>

alech/libquvi-scripts,legatvs/libquvi-scripts,alech/libquvi-scripts,legatvs/libquvi-scripts