Updates for CIM

[Mark Clements]

Two brief reports.

First, trying to install Cim from git (Ubuntu 18.04), I needed to first
run `autoreconf -i`. Can this be added to the INSTALL file, please?

Second, the compiler gives a number of warnings for implicit
declarations of functions. The first for function 'exit' can be
addressed by adding the header

#include <stdlib.h>

to the generated .c file. I wasn't certain how to start with changing
the code generator...

I hope that this is helpful.

Sincerely, Mark.


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