Use shared atlas in liblapack for hmatrix
Update haskell-hspec and related packages
Merge pull request #3550 from sol/update-hspec

Update haskell-hspec and related packages
luminanceHDR: add version 2.4.0

fixes #3229
Merge pull request #3547 from nilcons/hmatrixfix

Use shared atlas in liblapack for hmatrix
haskell-webkit: restrict meta.platforms to Linux; we cannot build that package on Darwin
haskell-vcsgui: restrict meta.platforms to Linux; we cannot build that package on Darwin
haskell-jack: restrict meta.platforms to Linux; we cannot build that package on Darwin
haskell-xmobar: restrict meta.platforms to Linux; we cannot build that package on Darwin
Allow optional functionality in SimGrid