When passing a package database to ghc-pkg via GHC_PACKAGE_PATH or
--package-db, ${pkgroot} does not get computed properly if the input path
contains a trailing slash.
Default behavior:
$ ghc-pkg describe base | grep pkgroot
pkgroot: "/usr/lib/ghc-7.10.2"
Correct behavior (no trailing slash):
$ ghc-pkg --package-db /usr/lib/ghc-7.10.2/package.conf.d describe base
| grep pkgroot
pkgroot: "/usr/lib/ghc-7.10.2"
$ GHC_PACKAGE_PATH=/usr/lib/ghc-7.10.2/package.conf.d ghc-pkg describe
base | grep pkgroot
pkgroot: "/usr/lib/ghc-7.10.2"
Incorrect behavior (with trailing slash):
$ ghc-pkg --package-db /usr/lib/ghc-7.10.2/package.conf.d/ describe
base | grep pkgroot
pkgroot: "/usr/lib/ghc-7.10.2/package.conf.d"
$ GHC_PACKAGE_PATH=/usr/lib/ghc-7.10.2/package.conf.d/ ghc-pkg describe
base | grep pkgroot
pkgroot: "/usr/lib/ghc-7.10.2/package.conf.d"
When this bug happens, ghc-pkg check complains about missing files for
packages using ${pkgroot}.
This bug happens because ${pkgroot} is computed using takeDirectory. It
should instead use (takeDirectory . dropTrailingPathSeparator)
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