2 string references to 'image_gd_check_settings'

ImageToolkitGdTestCase::testManipulations in modules/simpletest/tests/image.test: Since PHP can't visually check that our images have been manipulated properly, build a list of expected color values for each of the corners and the expected height and widths for the final images.
system_image_toolkits in modules/system/system.module: Implements hook_image_toolkits().

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