Declare all CLI prog deps with <PROG>_CMD variables #60
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Change all literal "git", "wc" and "grep" strings throughout gitstats with
corresponding _CMD variables. (Also upper-case existing "gnuplot_cmd"
variable while at it.)
NixOS/nixpkgs1 generally patch programs at build time to call their
CLI deps with absolute paths (meaning: known versions of those deps).
This makes packaging across different unix systems much more reliable.
This patch makes it easier to do that build time patching :-)