Tweak storage file size calculations.  Avoid overflow when calculating 80% of available storage on 32-bit Linux (most fields in struct statfs are long instead of int64_t as in BSD)
Tweak storage file size calculations.  Avoid overflow when calculating 80%
of available storage on 32-bit Linux (most fields in struct statfs are long
instead of int64_t as in BSD)

git-svn-id: 7d4b18ab7d176792635d6a7a77dd8cbbea8e8daa@1009 d4fa192b-c00b-0410-8231-f00ffab90ce4

ssm/pkg-varnish,CartoDB/Varnish-Cache,ssm/pkg-varnish,wikimedia/operations-debs-varnish,CartoDB/Varnish-Cache,ssm/pkg-varnish,wikimedia/operations-debs-varnish,wikimedia/operations-debs-varnish,CartoDB/Varnish-Cache,wikimedia/operations-debs-varnish,ssm/pkg-varnish,wikimedia/operations-debs-varnish,ssm/pkg-varnish