Ensure correct prosody binaries after upgrade

src/freedombone-app-xmpp

 XMPP_CIPHERS='"EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA256:EECDH:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA128-SHA:AES128-SHA"'
 XMPP_ECC_CURVE='"secp384r1"'
 
+prosody_latest_version='0.10'
+prosody_nightly=319
+prosody_nightly_hash='f1fdc8ce5b6f8bfa451d458616a0bbe5ed7c15881415e561586bab39bd705fa4'
+prosody_filename=prosody-${prosody_latest_version}-1nightly${prosody_nightly}
+
 xmpp_variables=(ONION_ONLY
                 INSTALLED_WITHIN_DOCKER
                 XMPP_CIPHERS
 function upgrade_xmpp {
     function_check update_prosody_modules
     update_prosody_modules
+
+    if [ -d ${INSTALL_DIR}/${prosody_filename} ]; then
+        # ensure that the binaries have not been overwritten
+        # by an operating system upgrade
+        cd ${INSTALL_DIR}/${prosody_filename}
+        make prefix=/usr install
+    fi
 }
 
 function backup_local_xmpp {
 }
 
 function install_xmpp_nightly {
-    prosody_latest_version='0.10'
-    prosody_nightly=319
-    prosody_nightly_hash='f1fdc8ce5b6f8bfa451d458616a0bbe5ed7c15881415e561586bab39bd705fa4'
-
     if [ ! -d $INSTALL_DIR ]; then
         mkdir -p $INSTALL_DIR
     fi
 
-    prosody_filename=prosody-${prosody_latest_version}-1nightly${prosody_nightly}
-
     cd $INSTALL_DIR
     wget https://prosody.im/nightly/${prosody_latest_version}/latest/${prosody_filename}.tar.gz
     if [ ! -f ${prosody_filename}.tar.gz ]; then