Fix .gitignore for tests/ directory... I hope.
Fix .gitignore for tests/ directory... I hope.

diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark,HIPERFIT/futhark,HIPERFIT/futhark,diku-dk/futhark