Ignore .ghci files

[fendor]

If there is a .ghci file with the following contents

:set +t

then the command:

> cabal v2-exec ghc -v0 -- -package-env=- -e "System.Environment.getExecutablePath >>= putStrLn"
/home/hugin/.ghcup/ghc/8.10.7/lib/ghc-8.10.7/bin/ghc
it :: ()

adds unexpected output.

Solution: ignore .ghci files via -ignore-dot-ghci
Also, add a regression test.