Land https://codereview.chromium.org/889083003/ to update libsrtp to upstream 1.5.0

srtp/crypto/replay/rdb.c

 /*
  * rdb.c
  *
  * Implements a replay database for packet security
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  */
 
 /*
@@ skipping 26 matching lines @@
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
 
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
 #include "rdb.h"
 
 
 /*
  * this implementation of a replay database works as follows:
  * 
  * window_start is the index of the first packet in the window
  * bitmask      a bit-buffer, containing the most recently entered
  *              index as the leftmost bit 
  *
@@ skipping 71 matching lines @@
 
   if (rdb->window_start++ > 0x7fffffff)
     return err_status_key_expired;
   return err_status_ok;
 }
 
 uint32_t
 rdb_get_value(const rdb_t *rdb) {
   return rdb->window_start;
 }