Haskell::Cabal: fix overquoting of flags
Haskell::Cabal: fix overquoting of flags

Since `system` escapes its own spaces, cabal was interpreting
`--flags='webapp s3'` as `+'webapp +s3'` rather than `+webapp +s3`.

Closes #267.

Signed-off-by: ilovezfs <fbd54dbbcf9e596abad4ccdc4dfc17f80ebeaee2@icloud.com>

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