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I assume that Cabal has just been growing, so haddock needs more memory
for the newer sources.

The testsuite doesn't know how to set a non-Unicode locale on Windows

T2507 sets LC_ALL=C, so doesn't run in a Unicode locale, and shouldn't
have unicode quotes.

Removes the need to explicitly pass it -fforce-recomp

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>

Refactored to solve Trac #5609