Several key targets unconditionally depend on `OSUtil.osutil` target, causing errors when it is unnecessarily linked, or not available. This PR fine-tuning the dependency on `OSUtil.osutil` to cleanly decouple those targets, and gracefully skip targets that need `osutil`. Main changes include: * Make `LIBC_COPT_USE_C_ASSERT` to a cmake config, allowing `LIBC_ASSERT` to use system's `assert` and not depending on `osutil`. * Adjust cmake dependency for the following targets: - libc.src.__support.libc_assert - libc.src.__support.time.* - libc.src.time.linux.* - libc.src.unistd.* - LibcTest * Give an option for `TestLogger` to use system's `fprintf` instead of `osutil`.
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