Force setting further copts variables via CMake
Force setting further copts variables via CMake

The `CMakeCache.txt` files revealed that some variables were not propagated correctly to the subprojects. Hopefully decreases build time of the CMake build. Disabling `BENCHMARK_ENABLE_INSTALL` in addition.

Closes https://github.com/google/iree/pull/424

COPYBARA_INTEGRATE_REVIEW=https://github.com/google/iree/pull/424 from marbre:cmake-copts ef6de266da016bb925548231450c9edf1f555456
PiperOrigin-RevId: 288726520

google/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree