cmake: Do not re-write `obj/build.h` unnecessarily #2956

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1 error and 5 warnings

The `brew link` step did not complete successfully

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!

libtool 2.4.7 is already installed and up-to-date. To reinstall 2.4.7, run: brew reinstall libtool

pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

libevent 2.1.12_1 is already installed and up-to-date. To reinstall 2.1.12_1, run: brew reinstall libevent

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!