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9192: internal: Build test-macros in a build script r=jonas-schievink a=jonas-schievink This build the test-proc-macros in `proc_macro_test` in a build script, and copies the artifact to `OUT_DIR`. This should make it available throughout all of rust-analyzer at no cost other than depending on `proc_macro_test`, fixing https://github.com/rust-analyzer/rust-analyzer/issues/9067. This hopefully will let us later write inline tests that utilize proc macros, which makes my life fixing proc macro bugs easier. Opening this as a sort of RFC, because I'm not totally sure this approach is the best. Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>