radvd: bump version

Fixes segfault issues with plug/unplug and other misc fixes.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/radvd/radvd.mk

@@ -3,7 +3,7 @@
 # radvd
 #
 #############################################################
-RADVD_VERSION:=1.2
+RADVD_VERSION:=1.5
 RADVD_SOURCE:=radvd-$(RADVD_VERSION).tar.gz
 RADVD_SITE:=http://www.litech.org/radvd/dist/
 RADVD_AUTORECONF:=no