Add th-abstraction-0.6.0.0 patch
For now, we must use __GLASGOW_HASKELL__ >= 907
instead of
MIN_VERSION_template_haskell(2,21,0)
, as the template-haskell
version has
not yet been changed to template-haskell-2.21.0.0
on GHC's master
branch
(see ghc!10936 (closed)).