Disable XDebug based on PHPUnit flags instead

Then we don't need to keep changing versions information.

.travis.yml

@@ -14,7 +14,7 @@ env:
 
 before_script:
   - if [[ $TRAVIS_PHP_VERSION = '7.0' && $DB = 'sqlite' ]]; then PHPUNIT_FLAGS="--coverage-clover ./build/logs/clover.xml"; else PHPUNIT_FLAGS=""; fi
-  - if [[ $TRAVIS_PHP_VERSION -lt '7.0' && $TRAVIS_PHP_VERSION != 'hhv*' ]]; then phpenv config-rm xdebug.ini; fi
+  - if [[ "$PHPUNIT_FLAGS" == "" ]]; then phpenv config-rm xdebug.ini; fi
   - composer self-update
   - composer install --prefer-source
   - if [ "$DEPENDENCIES" != "low" ]; then composer update; fi;