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

srtp/crypto/replay/rdbx.c

 /*
  * rdbx.c
  *
  * a replay database with extended range, using a rollover counter
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  */
 
 /*
@@ skipping 25 matching lines @@
  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (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 "rdbx.h"
 
 
 /*
  * from RFC 3711:
  *
  * A receiver reconstructs the index i of a packet with sequence
  *  number SEQ using the estimate
  *
  * i = 2^16 * v + SEQ,
@@ skipping 287 matching lines @@
 #else  
   *guess = s;
 #endif
 
 #ifdef NO_64BIT_MATH
   return s - (uint16_t) low32(rdbx->index);
 #else
   return s - (uint16_t) rdbx->index;
 #endif
 }