Fix deqp regression of basic_copyteximage2d*
Disable VREND_STORAGE_GL_IMMUTABLE when feat_egl_image_storage is unavailable
Regression was introduced by !269 (comment 377300)
Edited by Woody Chow
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Disable VREND_STORAGE_GL_IMMUTABLE when feat_egl_image_storage is unavailable
Regression was introduced by !269 (comment 377300)