Fix for S3TC on Android and IOS devices
Fix for S3TC on Android and IOS devices

On some platforms, exporters are prevented from exporting S3TC textures. This causes problems if the .import file contains a reference to such a texture - the exported project will attempt to load the S3TC, fail, and probably crash.

This PR prevents this problem by faking lack of hardware support for S3TC on the affected platforms. This prevents the engine attempting to load the S3TC and avoids the problem.

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot