Update libsrtp to 1.5.2

srtp/test/rtpw.c

 /*
  * rtpw.c
  *
  * rtp word sender/receiver
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  *
  * This app is a simple RTP application intended only for testing
  * libsrtp.  It reads one word at a time from /usr/dict/words (or
@@ skipping 50 matching lines @@
 #include <stdio.h>          /* for printf, fprintf */
 #include <stdlib.h>         /* for atoi()          */
 #include <errno.h>
 #include <signal.h>         /* for signal()        */
 
 #include <string.h>         /* for strncpy()       */
 #include <time.h>           /* for usleep()        */
 
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>         /* for close()         */
+#elif defined(_MSC_VER)
+#include <io.h>             /* for _close()        */
+#define close _close
 #endif
 #ifdef HAVE_SYS_SOCKET_H
 # include <sys/socket.h>
 #endif
 #ifdef HAVE_NETINET_IN_H
 # include <netinet/in.h>
 #elif defined HAVE_WINSOCK2_H
 # include <winsock2.h>
 # include <ws2tcpip.h>
 # define RTPW_USE_WINSOCK2      1
@@ skipping 382 matching lines @@
         len = hex_string_to_octet_string(key, input_key, expected_len);
     }
     /* check that hex string is the right length */
     if (len < expected_len) {
       fprintf(stderr, 
               "error: too few digits in key/salt "
               "(should be %d digits, found %d)\n",
               expected_len, len);
       exit(1);    
     } 
-    if (strlen(input_key) > policy.rtp.cipher_key_len*2) {
+    if ((int) strlen(input_key) > policy.rtp.cipher_key_len*2) {
       fprintf(stderr, 
               "error: too many digits in key/salt "
               "(should be %d hexadecimal digits, found %u)\n",
               policy.rtp.cipher_key_len*2, (unsigned)strlen(input_key));
       exit(1);    
     }
     
     printf("set master key/salt to %s/", octet_string_hex_string(key, 16));
     printf("%s\n", octet_string_hex_string(key+16, 14));
   
@@ skipping 216 matching lines @@
   }
 #else
   if (signal(SIGTERM, handle_signal) == SIG_ERR) {
     fprintf(stderr, "%s: error setting up signal handler", name);
     perror("");
     return -1;
   }
 #endif
   return 0;
 }