Hadrian: runghc wrapper is not passed libdir

The runGhc wrapper created by Hadrian is not passed libdir, unlike the wrapper for the ghc executable. This can lead to inconsistencies, where ghc and runGhc end up looking for the libdir in different places. This is undesirable as it complicates things when one tries to relocate the wrappers (different wrappers behaving differently).

The fix is simple: pass libdir to the runGhc wrapper, matching the behaviour of the ghc executable wrapper. Fix in !8581 (closed).

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information