default debug to 0

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@6726 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/sofia-sip/configure.gnu

 #! /bin/sh
-./configure "$@" --with-pic --with-glib=no --disable-shared
+CFLAGS="$CFLAGS -DSU_DEBUG=0" ./configure "$@" --with-pic --with-glib=no --disable-shared