This follows up commit 2e9c43aa9a, which was
incomplete. Fixes <https://bugs.gnu.org/39358>.
* gnu/packages/patches/ghc-testsuite-dlopen-pie.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly. Also use tabs instead
of spaces on surrounding patches.
* gnu/packages/haskell.scm (ghc-8.6)[native-inputs]: Add patch for
"ghc-testsuite".
[arguments]: Remove incomplete workaround for the same issue.
