[CMake] What is the best way to change default settings

[Frank Hilliger]

Hi,

I want to remove the /GZ flag which is set for Windows Visual C++ compilers
in CMAKE_CXX_FLAGS_DEBUG_INIT. Furthermore I want to remove some .lib files
defined in CMAKE_C_STANDARD_LIBRARIES_INIT. 
How I can achieve this without touching
CMake\Modules\Platform\Windows-cl.cmake  ?
I tried remove_definitions(), but without success.

Thank you in advance.
Best regards,
Frank