agentpp: update URL address

Signed-off-by: Jerzy Grzegorek <jerzy.grzegorek@trzebnica.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/agentpp/agentpp.mk

@@ -6,7 +6,7 @@
 
 AGENTPP_VERSION = 4.0.3
 AGENTPP_SOURCE = agent++-$(AGENTPP_VERSION).tar.gz
-AGENTPP_SITE = http://www.agentpp.com
+AGENTPP_SITE = http://www.agentpp.com/download
 AGENTPP_LICENSE = Apache-2.0
 AGENTPP_LICENSE_FILES = LICENSE-2_0.txt
 AGENTPP_INSTALL_STAGING = YES