fontconfig build broken on 2015Q3

[David Bariod <davidriod%googlemail.com@localhost>]

Hello,

The fontconfig does not build on mac os X 10.11 on the 2015Q3 branch.
It seems we could benefit of the backport of the following patch from
trunk (sorry references from the git mirror) on the 2015Q3 branch

da1305e76113c21911315e33d3e7aaa21b5545b5

Best regards,
David Bariod