fix for FSBUILD-24

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6083 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_wanpipe/Makefile

 BASE=../../../..
-LIBPRI_HOST=http://ftp.digium.com/pub/libpri
-LIBPRI=libpri-1.2.5
+LIBPRI_HOST=http://downloads.digium.com/pub/libpri
+LIBPRI=libpri-1.2.6
 LIBPRI_FILE=$(LIBPRI).tar.gz
 LIBPRI_DIR=$(BASE)/libs/$(LIBPRI)
 WANPIPE=wanpipe-3.1.1