Revert "shairport-sync: bump to version 3.0"

This reverts commit 7670dcc43e3b023b9bd613fa464533ecde7aca70, which
causes a Config.in circular dependency:

package/openssl/Config.in:1:error: recursive dependency detected!
package/openssl/Config.in:1:	symbol BR2_PACKAGE_OPENSSL is selected by BR2_PACKAGE_MBEDTLS
package/mbedtls/Config.in:1:	symbol BR2_PACKAGE_MBEDTLS is selected by BR2_PACKAGE_OPENSSL

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/shairport-sync/Config.in

@@ -6,7 +6,7 @@ config BR2_PACKAGE_SHAIRPORT_SYNC
 	select BR2_PACKAGE_ALSA_LIB_MIXER
 	select BR2_PACKAGE_LIBCONFIG
 	select BR2_PACKAGE_LIBDAEMON
-	select BR2_PACKAGE_MBEDTLS if !BR2_PACKAGE_OPENSSL
+	select BR2_PACKAGE_POLARSSL if !BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_POPT
 	help
 	  Shairport Sync emulates an AirPort Express for the purpose of

package/shairport-sync/shairport-sync.hash

@@ -1,2 +1,2 @@
 # Locally calculated
-sha256  d02697810da0a2c10d3b39e8c9e0795af1e81fff065db1e27514cdb5da696108  shairport-sync-3.0.tar.gz
+sha256  2e73416ac8fdda1657034afaa143f1710852ebed06e0aa43dafc2b7dc5eb653d  shairport-sync-2.8.6.tar.gz

package/shairport-sync/shairport-sync.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SHAIRPORT_SYNC_VERSION = 3.0
+SHAIRPORT_SYNC_VERSION = 2.8.6
 SHAIRPORT_SYNC_SITE = $(call github,mikebrady,shairport-sync,$(SHAIRPORT_SYNC_VERSION))
 
 SHAIRPORT_SYNC_LICENSE = MIT, BSD-3c
@@ -36,8 +36,8 @@ ifeq ($(BR2_PACKAGE_OPENSSL),y)
 SHAIRPORT_SYNC_DEPENDENCIES += openssl
 SHAIRPORT_SYNC_CONF_OPTS += --with-ssl=openssl
 else
-SHAIRPORT_SYNC_DEPENDENCIES += mbedtls
-SHAIRPORT_SYNC_CONF_OPTS += --with-ssl=mbedtls
+SHAIRPORT_SYNC_DEPENDENCIES += polarssl
+SHAIRPORT_SYNC_CONF_OPTS += --with-ssl=polarssl
 endif
 
 ifeq ($(BR2_PACKAGE_SHAIRPORT_SYNC_LIBSOXR),y)