apr_uuid is not thread safe

[Doug MacEachern]

static void get_current_time(apr_uint64_t *timestamp)
{
    /* ### this needs to be made thread-safe! */

    apr_uint64_t time_now;
    static apr_uint64_t time_last = 0;
    static int fudge = 0;

any plans/thoughts on making it threadsafe?