Fix building with xfsprogs 4.5.0
authorRuben Kerkhof <ruben@rubenkerkhof.com>
Sat, 26 Mar 2016 17:18:44 +0000 (18:18 +0100)
committerRuben Kerkhof <ruben@rubenkerkhof.com>
Sat, 26 Mar 2016 17:18:44 +0000 (18:18 +0100)
xfsprogs 4.5.0 started to use off64_t in its headers,
which is hidden behind _GNU_SOURCE

Fixes #1637


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