minor #2299 Travis: proper xdebug disabling (keradus)
minor #2299 Travis: proper xdebug disabling (keradus)

This PR was merged into the 1.12 branch.

Discussion
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Travis: proper xdebug disabling

Commits
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040bf42 Travis: proper xdebug disabling

keradus/PHP-CS-Fixer,Slamdunk/PHP-CS-Fixer,gharlan/PHP-CS-Fixer,lucasmichot/PHP-CS-Fixer,Soullivaneuh/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,Slamdunk/PHP-CS-Fixer,felixgomez/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,FriendsOfPHP/PHP-CS-Fixer,GrahamCampbell/PHP-CS-Fixer,SpacePossum/PHP-CS-Fixer,gharlan/PHP-CS-Fixer,keradus/PHP-CS-Fixer,felixgomez/PHP-CS-Fixer,kubawerlos/PHP-CS-Fixer,lucasmichot/PHP-CS-Fixer,Soullivaneuh/PHP-CS-Fixer