Allow use of standard integer types.
Allow use of standard integer types.

Include appropriate headers for standard integer types in e_os2.h

This should use stdint.h, inttypes.h or a workaround for systems which
have neither.

Reviewed-by: Matt Caswell <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@openssl.org>

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl