Revert "disable these options if zrtp isn't enabled"

Brian and I talked about this and concurred on the reversion here.
Part of the point of the ZRTP pass-through mode code is that it allows
two legs to have a ZRTP-enabled call even if FS doesn't have ZRTP.

This reverts commit f0aa4ab3.

src/switch_channel.c

@@ -2952,7 +2952,6 @@ SWITCH_DECLARE(switch_status_t) switch_channel_perform_mark_ring_ready_value(swi
 	return SWITCH_STATUS_FALSE;
 }
 
-#ifdef ENABLE_ZRTP
 SWITCH_DECLARE(void) switch_channel_check_zrtp(switch_channel_t *channel)
 {
 
@@ -3001,7 +3000,7 @@ SWITCH_DECLARE(void) switch_channel_check_zrtp(switch_channel_t *channel)
 		}
 	}
 }
-#endif
+
 
 
 
@@ -3014,9 +3013,7 @@ SWITCH_DECLARE(switch_status_t) switch_channel_perform_mark_pre_answered(switch_
 		const char *uuid;
 		switch_core_session_t *other_session;
 
-#ifdef ENABLE_ZRTP
 		switch_channel_check_zrtp(channel);
-#endif
 		switch_log_printf(SWITCH_CHANNEL_ID_LOG, file, func, line, switch_channel_get_uuid(channel), SWITCH_LOG_NOTICE, "Pre-Answer %s!\n", channel->name);
 		switch_channel_set_flag(channel, CF_EARLY_MEDIA);
 		switch_channel_set_callstate(channel, CCS_EARLY);
@@ -3276,9 +3273,7 @@ SWITCH_DECLARE(switch_status_t) switch_channel_perform_mark_answered(switch_chan
 		switch_mutex_unlock(channel->profile_mutex);
 	}
 
-#ifdef ENABLE_ZRTP
 	switch_channel_check_zrtp(channel);
-#endif
 	switch_channel_set_flag(channel, CF_ANSWERED);
 	switch_channel_set_callstate(channel, CCS_ACTIVE);