Fix glitches in gnutls.c, mostly memory-related
* gnutls.c: Sort macro definitions by name. (fn_gnutls_transport_set_errno): Omit unreachable definition. (fn_gnutls_x509_crt_get_signature): Omit unused symbol. (gnutls_hex_string): Arg is now unsigned char *, to avoid a cast. Prefer ptrdiff_t for sizes. Check for arithmetic overflow when calculating string length. Use make_uninit_string, to avoid copying the string. Cast the char, not the pointer. (gnutls_certificate_details): Use xmalloc and xfree, not malloc and free. Work even for dates past the year 9999. Use void * for buffers, to avoid casts.
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