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)).