Use CMAKE_CXX_COMPILER_LAUNCHER instead of RULE_LAUNCH_COMPILE

https://github.com/facebook/rocksdb/blob/25d54c799ce5fb6887a151f4f584bf8d84c1256e/CMakeLists.txt#L60-L61

This should be replaced with the new way of using `CMAKE_CXX_COMPILER_LAUNCHER` var instead of global property.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_LANG_COMPILER_LAUNCHER.html

When combined with `set(... CACHE ...)` or `option()`, it will allows user overwrite when ccache is not wanted on system with ccache installed, or when multiple ccache are available but the found one is incorrect.

This feature is available since CMake 3.4, within https://github.com/facebook/rocksdb/blob/25d54c799ce5fb6887a151f4f584bf8d84c1256e/CMakeLists.txt#L35 , so it should be safe to switch.

Similar issue also reported here:
https://github.com/Tencent/rapidjson/issues/1794