retroarch/cores.nix: cleanup

- Avoid using overrides unless necessary
- Set platform and ARCH by default
- Don’t set dontConfigure unless absolutely necessary
- Use preBuild instead of overriding entire configurePhase
This commit is contained in:
Matthew Bauer 2020-03-21 22:54:01 -04:00
parent d513980ea6
commit f094e132e2

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