'mc' package needs some fixes

[ng0]

Is someone interested in fixing our `mc' package? It is
functional, but some parts of it are not functional for Guix. Grep
for "/bin/" in the directory of $(guix build mc) shows results
which assume the existence of /bin/ (not
/gnu/store/.../bin/$binary, where I don't mean shebangs but
further down in the scripts.
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