Port memory-full checking to GnuTLS 3.3
Instead of using gnutls_global_set_mem_functions, check every call to a GnuTLS function that might return an indication of memory exhaustion. Suggested by Dmitry Antipov in: http://lists.gnu.org/archive/html/emacs-devel/2014-12/msg02056.html * src/gnutls.c (gnutls_global_set_mem_functions) [WINDOWSNT]: Remove. (init_gnutls_functions): Do not load gnutls_global_set_mem_functions. (fn_gnutls_global_set_mem_functions) [!WINDOWSNT]: Remove. All uses removed. (check_memory_full): New function. (emacs_gnutls_handshake, emacs_gnutls_handle_error) (gnutls_make_error, Fgnutls_boot): Use it. (emacs_gnutls_global_init): Avoid gnutls_global_set_mem_functions.
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