testsuite: Ensure that GHC doesn't pick up environment files
Here we set GHC_ENVIRONMENT="-" to ensure that GHC invocations of tests don't pick up a user's local package environment.
Fixes #21365 (closed).
Here we set GHC_ENVIRONMENT="-" to ensure that GHC invocations of tests don't pick up a user's local package environment.
Fixes #21365 (closed).