rabbitmq-server: add missing host dependencies

Fixes:
http://autobuild.buildroot.net/results/0ec785b8fa876d879934af618851d77a3ce70f55
http://autobuild.buildroot.net/results/03eb39eb9498eb42202ac8b16c1ffc175c0b69d3
http://autobuild.buildroot.net/results/199b04408fa8d9c94b9bed42fdcaafb03278f03c

Signed-off-by: Frank Hunleth <fhunleth@troodon-software.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/rabbitmq-server/rabbitmq-server.mk

@@ -17,7 +17,7 @@ RABBITMQ_SERVER_LICENSE_FILES = LICENSE-MPL-RabbitMQ \
 				LICENSE-MIT-Mochi LICENSE-MIT-Mochiweb \
 				LICENSE-MIT-Sammy060 LICENSE-MIT-SockJS \
 				LICENSE-MPL2
-RABBITMQ_SERVER_DEPENDENCIES = erlang libxslt
+RABBITMQ_SERVER_DEPENDENCIES = host-libxslt host-zip erlang libxslt
 RABBITMQ_SERVER_TARGET_BINS = rabbitmq-plugins rabbitmq-server rabbitmqctl rabbitmq-env rabbitmq-defaults
 
 define RABBITMQ_SERVER_BUILD_CMDS