Removed 'library' Cabal flag.

Reason: starting with Cabal 1.8, installing pandoc with '-library
+executable' did not work, since the build-depends in the Library
stanza were ignored. The problem could be solved by repeating the
build-depends in the Executable stanza, but this seems non-ideal
(and might lead to errors later on).  The '-library' option isn't
so useful anyway, since to compile pandoc in the first place, you
need a large number of Haskell libraries installed, and in this
case, why balk at another? It was chiefly intended for packagers,
but packagers will need to use a chroot environment anyway, and
they can then simply copy the executable and not the library.

Thanks to Jim Pryor for calling the problem to my attention
in connection with an arch linux package.

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