Commit cef1eafb7727f17c5adb625f140833fe73aea38a

Don Olmstead 2024-06-13T14:03:36

Use find_package for ICU ICU 75.1 requires C++17 support so use `find_package(ICU)` which determines the versioning. Sets `CMAKE_CXX_STANDARD` when that happens. Follows along with what Meson build did in 93d58f83.