Fix #188: Create file /etc/default/locale

File is created "manually" to keep cron happy and prevent it from
spewing errors into the log. Hopefully this will be enough.

build-scripts/postfix-install.sh

@@ -36,4 +36,11 @@ else
     do_ubuntu
 fi
 
+# Some services (eg. cron) will complain if this file does not exists, even if it's empty
+# The file is usually generated by update-locales, which is ran automatically when you do
+# `apt-get install locales`. So instead of adding another package, which at the moment we
+# do not need, we just create a simple "empty" file instead and hope to keep cron happy.
+mkdir -p /etc/default/
+echo "#  File generated by postfix-install.sh" > /etc/default/locale
+
 cp -r /etc/postfix /etc/postfix.template