ghc-8.8.1 release tarball requires alex at ./configure time

GHC release tarballs used not to require alex or happy and included generated versions of parser and lexer.

ghc-8.8.1 release tarball seems to be different and fails ./configure step:

./configure
...
checking for happy... no
checking for version of happy...
checking for alex... no
checking for version of alex...
configure: error: Alex version 3.1.7 or later is required to compile GHC.

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