Bug#576453: Cannot install ca-certificates-java

[Emmanuel Bourg]

Under OpenVZ the max heap size is considered to be used immediately by
the java process. If -Xmx is not specified the default size may be 1 GB
or higher, and this often causes java processes to fail under OpenVZ if
the memory isn't available.

ca-certificates-java doesn't need that much memory to work properly,
limiting the heap to 64M should be enough.

Emmanuel Bourg