Fix invalid code signatures on aarch64-darwin after set-git-rev
On aarch64-darwin (Apple Silicon), all executables must have valid code signatures. The set-git-rev tool uses Data.FileEmbed.injectWith to binary-patch a dummySpace placeholder in the executable with the actual git revision hash. This modifies the Mach-O binary content, invalidating the ad-hoc code signature that the linker created. The wrapper derivation created by applyPatches uses phases="unpackPhase patchPhase installPhase" (no fixupPhase), so nixpkgs' autoSignDarwinBinariesHook never runs. This results in executables like db-analyser being unusable on Apple Silicon. Re-sign all binaries with ad-hoc signatures after set-git-rev runs.