pw_chrono: Extend CMake support
pw_chrono: Extend CMake support

Change-Id: I32ffab2c629e18efe763dba8cddcb627f577b36c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/79726
Reviewed-by: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Commit-Queue: Ewout van Bekkum <638f134dbc68778d6b859fb04a64baea2b00b021@google.com>
Pigweed-Auto-Submit: Ewout van Bekkum <638f134dbc68778d6b859fb04a64baea2b00b021@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed