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

srtp/crypto/kernel/key.c

 /*
  * key.c
  *
  * key usage limits enforcement
  * 
  * David A. Mcgrew
  * Cisco Systems, Inc.
  */
 /*
  *      
@@ skipping 24 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 "key.h"
 
 #define soft_limit 0x10000
 
 err_status_t
 key_limit_set(key_limit_t key, const xtd_seq_num_t s) {
 #ifdef NO_64BIT_MATH
   if (high32(s) == 0 && low32(s) < soft_limit)
     return err_status_bad_param;
 #else
@@ skipping 51 matching lines @@
 #else
   if (key->num_left < 1)
 #endif
   { /* we just hit the hard limit */
     key->state = key_state_expired;
     return key_event_hard_limit;
   }
    return key_event_soft_limit;
 }