emacs_write: Return size_t, not ssize_t, to avoid overflow issues.
* gnutls.c, gnutls.h (emacs_gnutls_write): Return size_t, not ssize_t. * sysdep.c, lisp.h (emacs_write): Likewise. Without the above change, emacs_gnutls_write and emacs_write had undefined behavior and would typically mistakenly report an error when writing a buffer whose size exceeds SSIZE_MAX. (emacs_read, emacs_write): Remove check for negative size, as the Emacs source code has been audited now. (emacs_write): Adjust to new signature, making the code look more like that of emacs_gnutls_write. * process.c (send_process): Adjust to the new signatures of emacs_write and emacs_gnutls_write. Do not attempt to store a byte offset into an 'int'; it might overflow.
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