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Remove `parallel` as a submodule

Alec Theriault requested to merge harpocrates/ghc:remove-parallel-submodule into master

parallel is used in exactly one place in the GHC tree: the T2317 test. It seems almost by accident that it is a submodule; libraries needed only for tests should not be included as submodules (see QuickCheck, async, haskell98, regex-compat, utf8-string, vector and more for examples).

T2317 will now get run only when parallel is installed instead of parallel being required for the testsuite to run.

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