[issue2005] posixmodule expects sizeof(pid_t/gid_t/uid_t) <= sizeof(long)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Checking whether a type is unsigned in configure.ac might be cumbersome...

This can be done in compile time. Something like:

  if ((uid_t)-1 > 0) ...

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