[arch-haskell] documentation failures due to conflicting with ghc docs

[Don Stewart]

So another issue raised by the documentation of packages:

    haskell-regex-base: /usr/share/doc/ghc/libraries/regex-base exists in filesystem

The docs are installed in the right place, then we do a symlink,

        install -d -m755 $pkgdir/usr/share/doc/ghc/libraries
        ln -s /usr/share/doc/${pkgname}/html ${pkgdir}/usr/share/doc/ghc/libraries/regex-base

Seems like something else we want to think about.

-- Don