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Use configure script to detect that we should use in-tree GMP on Windows

Sylvain Henry requested to merge hsyl20/ghc:hsyl20-gmp-configure into master

To enable in-tre GMP build, Hadrian was explicitly checking both the GmpInTree flag and if the host was windows. It did it wrong in one place (in gmpObjects it only tested GmpInTree). To make the process less fragile, we set the GmpInTree flag in the configure script on Windows.

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