Prevent the linking of gpm in when we don't need it

[Jeremy White]

It looks like setup rarely (never?) uses GPM, and yet if
it's on the build system, it gets linked in.

What's worse, it gets linked in dynamically.  This means
that on a system with no libgpm (i.e. my 32 bit emul
environment), setup fails to run.

This patch modifies the linker so that if NCURSES_MOUSE_VERSION
is defined, we don't use gpm.

If it would be better to just strip gpm out altogether,
let me know, I can work up a patch for that too.

Cheers,

Jeremy
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