SSL: clear error queue after SSL_CTX_load_verify_locations().
SSL: clear error queue after SSL_CTX_load_verify_locations().

The SSL_CTX_load_verify_locations() may leave errors in the error queue
while returning success (e.g. if there are duplicate certificates in the file
specified), resulting in "ignoring stale global SSL error" alerts later
at runtime.

firebase/nginx,firebase/nginx,firebase/nginx,hy0kl/nginx,hy0kl/nginx,hy0kl/nginx,firebase/nginx