purego: remove r1, r2, err fields as they are no longer used

ebitengine / purego

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purego: remove r1, r2, err fields as they are no longer used #218

Closed TotallyGamerJet closed 4 months ago

TotallyGamerJet commented 4 months ago

When struct returns were added I stopped using r1, and r2 for return values. In doing so I did not update purego.SyscallN which ebitengine uses for Metal and OpenGL. This PR fully removes those fields and fixes purego.SyscallN to return the proper values.

Closes #217