Specify stack size to avoid java.lang.StackOverflowError (Closes: #999900)
i386 platform uses smaller stack size. This breaks epubcheck on large ePub.
Add -Xss1024k to use 1024kb stack.
jarwrapper accepts Debian-Java-Parameters property in JAR manifest to
add own Java run-time options.
See also: https://github.com/w3c/epubcheck/wiki/Running#javalangstackoverflowerror