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9.4.1: hadrian: also include boot-generated files only needed for make

sterni requested to merge sternenseemann/ghc:ghc-9.4-hadrian-make-bootfiles into ghc-9.4

For some libraries the boot script generates a ghc.mk and GNUmakefile which is required for the make build system. We also should include these files in the source-dist to save make users from having to run the ./boot.source script in the tarball (which confusingly has a different name to previous GHC releases, thanks to hadrian).

With this change, the source-dist should be on parity with GHC 9.2.2 and earlier releases again after the regression in GHC 9.2.3.

Closes #21626.

This only targets ghc-9.4, since the change is no longer relevant for GHC >= 9.5 where make has been dropped.

I tested this change by generating a tarball using ./hadrian/build source-dist and then building GHC from that tarball without running boot.source which worked fine.

cc @mpickering

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