There's a deadlock when ssleay_rand_bytes is called the first time, since

There's a deadlock when ssleay_rand_bytes is called the first time, since
it wants to stir the pool using ssleay_rand_add.  This fix provides the
possibility to call ssleay_rand_add inside a locked state by simply telling
it not to do any locking through a static variable.  This isn't the most
elegant way one could do this, but it does retain thread safety during the
stirring process.