Replace mkDerivedConstants.c with DeriveConstants.hs
DeriveConstants.hs works in a cross-compilation-friendly way. Rather than running a C program that prints out the constants, we just compile a C file which has the constants are encoded in symbol sizes. We then parse the output of 'nm' to find out what the constants are. Based on work by Gabor Greif <email@example.com>.
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