res_rtp_asterisk: Move where DTLS MTU variable is defined.

The DTLS MTU variable is not dependent on pjproject and should
not exist in its block.

Change-Id: I7e97d64dc192f2ac81bfe2b72b8229d321c7d026

res/res_rtp_asterisk.c

@@ -197,6 +197,9 @@ static int nochecksums;
 static int strictrtp = DEFAULT_STRICT_RTP; /*!< Only accept RTP frames from a defined source. If we receive an indication of a changing source, enter learning mode. */
 static int learning_min_sequential = DEFAULT_LEARNING_MIN_SEQUENTIAL; /*!< Number of sequential RTP frames needed from a single source during learning mode to accept new source. */
 static int learning_min_duration = DEFAULT_LEARNING_MIN_DURATION; /*!< Lowest acceptable timeout between the first and the last sequential RTP frame. */
+#if defined(HAVE_OPENSSL) && (OPENSSL_VERSION_NUMBER >= 0x10001000L) && !defined(OPENSSL_NO_SRTP)
+static int dtls_mtu = DEFAULT_DTLS_MTU;
+#endif
 #ifdef HAVE_PJPROJECT
 static int icesupport = DEFAULT_ICESUPPORT;
 static struct sockaddr_in stunaddr;
@@ -204,9 +207,6 @@ static pj_str_t turnaddr;
 static int turnport = DEFAULT_TURN_PORT;
 static pj_str_t turnusername;
 static pj_str_t turnpassword;
-#if defined(HAVE_OPENSSL) && (OPENSSL_VERSION_NUMBER >= 0x10001000L) && !defined(OPENSSL_NO_SRTP)
-static int dtls_mtu = DEFAULT_DTLS_MTU;
-#endif
 
 static struct ast_ha *ice_blacklist = NULL;    /*!< Blacklisted ICE networks */
 static ast_rwlock_t ice_blacklist_lock = AST_RWLOCK_INIT_VALUE;