Function is_hdr_continuation

http.c:215–218

* A folded header continuation line starts with any number of spaces or * horizontal tab characters (SP or HTAB) as per RFC 7230 section 3.2. * It is not a continuation line if the line starts with any other character. */

 * It is not a continuation line if the line starts with any other character.
 */
static inline int is_hdr_continuation(const char *ptr, const size_t size)
{
	return size && (*ptr == ' ' || *ptr == '\t');
}

static size_t fwrite_wwwauth(char *ptr, size_t eltsize, size_t nmemb, void *p MAYBE_UNUSED)
{