shairport-sync: update to v2.8.6

Signed-off-by: Dmitry Sutyagin <f3flight@gmail.com>

sound/shairport-sync/Makefile

@@ -9,7 +9,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=shairport-sync
-PKG_VERSION:=2.8.4
+PKG_VERSION:=2.8.6
 PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git