travis: use Xcode 7.2 on 10.11 and 7.1.1 on 10.10
travis: use Xcode 7.2 on 10.11 and 7.1.1 on 10.10

Closes #47056.

Signed-off-by: Martin Afanasjew <54669547a225ff20cba8b75a4adca540eef25858@afanasjew.de>

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