[CMake] Remove default compiler options

[Sylvain Benner]

There is a light list of useful CMake variables here : 
http://www.cmake.org/Wiki/CMake_Useful_Variables

Sylvain

>> The GR option is driven by CMAKE_CXX_USE_RTTI variable.
>> For the GS option I don't know where it is set.
>
> Is there a list of options having an influence on the way targets are
> compiled somewhere ?
>
>
>
> -- 
> Antoine Tollenaere
>
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