Fix possible _SC_OPEN_MAX max problem on AIX.
Fix possible _SC_OPEN_MAX max problem on AIX.

* src/posix-io.c [HAVE_STDINT_H]: Include stdint.h.
(get_max_fds): Limit returned value for too high values.
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Signed-off-by: Werner Koch <13bd1fc5137f503b0a8355ad400e7a87ebb45b25@gnupg.org>

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme