build: only write build_number.txt when BUILD_NUMBER has changed
* prevents $(file <.../out/build_number.txt) was changed, regenerating... Change-Id: I801be27695fd983bee01d0b0d4ef0948392cb849
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* prevents $(file <.../out/build_number.txt) was changed, regenerating... Change-Id: I801be27695fd983bee01d0b0d4ef0948392cb849
mentioned in commit 95373d11