[PATCH] Fix compiler warnings in defmod

[Dave Lambley]

Hello,

The attached patch resolves warnings picked up by gcc and clang (as
supplied by Ubuntu 18.04) when compiling defmod. It now compiles cleanly on
my amd64 machine.

There's a few silly fixes where there's no real problem, but also lots of
apparently inadequately sized buffers. Also, pointer casting shenanigans.

Best regards,
Dave
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