Add a constraint reflecting #665 to the package description #698
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Some combinations of Apple toolchains and GHC versions will provide headers that anger -Werror=undef. See discussion at that #665.
This is the same condition as in the Hackage revision 0.12.1.0-r1, but I've moved it out of the
else
branch so that it also applies if the pure-haskell flag is set.