jabberd2: changed build prio (160.000 -> 800.000)

Note:

There is no need to build jabberd2 that early because nothing else depends
on it but nowadays jabberd2 depends on cppunit.

network/jabberd2/jabberd2.desc

@@ -33,6 +33,6 @@
 [L] GPL
 [S] Stable
 [V] 2.2.16
-[P] X -----5---9 160.000
+[P] X -----5---9 800.000
 
 [D] 366305182 jabberd-2.2.16.tar.gz https://github.com/downloads/Jabberd2/jabberd2/