Hadrian: refactor GMP in-tree build support (#17756)
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Hadrian doesn't rely on integer-gmp's
config.mk(untracked) to detect if in-tree GMP build should be used. It only relies on was has been passed to the top levelconfigure(--with-intree-gmpor not). -
in-tree GMP isn't built once for all in a fixed stage (Stage1) anymore. It is built per stage which is required if we build a cross-compiler
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"wrappers.c" now includes "ghc-gmp.h" instead of "ghc.h"
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switching between in-tree and external GMP is now supported
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build in-tree GMP in "/stageN/gmp/gmpbuild" and produce useful artefacts (libgmp.a, gmp.h, objs/*.o) in "/stageN/gmp"