[CMake] Detecting -m32 build target on 64-bit host

[Nils Gladitz]

On 23.04.2015 18:00, Mateusz Loskot wrote:
> It's better, indeed, but what about
>
> "This is set to the size of a pointer on the target machine for which
> the (machine) code is generated."

Hm that is in my opinion too redundant.
There is only one target machine as far as cmake is concerned and there 
is no need to further disambiguate.

Nils