Make gcc bark less when using some warnings

[Vincent Béron]

Gcc (with -Wimplicit -Wmissing-declarations -Wmissing-prototypes) didn't
like some of those prototypes, they didn't look like matching.

The extern was mishandled: present when it shouldn't, absent when it
shouldn't.

Changelog:
Change prototypes so gcc with some warnings doesn't bark.

Vincent
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