[m-dev.] for review: report undef symbols for shared libs

[Zoltan Somogyi]

> Ensure that `ml' by default reports errors about undefined symbols
> when building shared libraries.  Add a new option `--allow-undefined'
> to enable the previous, more permissive behaviour.

I did not check the actual ld options, but apart from that, the change looks
OK.

Zoltan.
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