Generate optimizer func info from stubs for ext/sodium

[kocsismate]

No description provided.

[nikic]

TBH I'd be inclined to just delete this func info entirely. We already get the most valuable part through arginfo, and optimizing refcount on cryptographic code seems more risky than useful.

[kocsismate]

OK, then I'll simply delete the @refcount parts. If we want to keep the additional return type hints, then we should also add a mechanism for excluding a function from being added to the optimizer func info. Or is it ok if the affected functions are added to it with a refcount of N?

[kocsismate]

@nikic Do you see any other function/extension in zend_func_info.c which shouldn't been added to zend_func_infos.h before I try to migrate them?