Do not declare MRT shader ouputs over the specified number #5395
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Fixes #5393
We used to declare 8 MRT outputs for all fragment shaders, assuming the compiler would ignore unused ones. Turns out this fails on some android devices that only support 4 attachments.
This PR addresses it by only declaring supported outputs, by stripping unsupported outputs using ifdefs. On a device with only 4 attachments, the generated code (after the pre-processor steps) looks like this, with only 4 instead of 8 outputs: