[cmake-developers] [PATCH] CPackRPM: Fix cross-building rpms

[Domen Vrankar]

> Add the --target argument to rpmbuild
> Do not add a BuildArch variable to the spec file for arch specific packages
> BuildArch causes rpm building to fail except for "noarch" packages

I'm not too familiar with cross compilation problems so could you
please also provide a simple test case to help with patch review?

Thanks,
Domen