Clean up after a build.

Usage: cabal v1-clean [FLAGS]

Removes .hi, .o, preprocessed sources, etc.

Flags for v1-clean:
 -h, --help                   # Show this help text
 -v[n], --verbose[=n]         # Control verbosity (n is 0--3, default
                                verbosity level is 1)
 --builddir=DIR               # The directory where Cabal puts generated build
                                files (default dist)
 --cabal-file=PATH            # use this Cabal file
 --keep-temp-files            # Keep temporary files.
 -s, --save-configure         # Do not remove the configuration file
                                (dist/setup-config) during cleaning. Saves
                                need to reconfigure.

The v1-clean command is a part of the legacy v1 style of cabal usage.

It is a legacy feature and will be removed in a future release of
cabal-install. Please file a bug if you cannot replicate a working v1- use
case with the nix-style commands.

For more information, see:
https://cabal.readthedocs.io/en/latest/nix-local-build-overview.html
