Multiarch support for mock

[Andreas Thienemann]

Hello,

I noticed some problems with mock, when building tools such as valgrind, 
syslinux etc. on x86_64.

The default mock config says to exclude i386 and similar packages.

However, these programs depend on stubs-32.h from the i386 glibc-devel 
package.
The x86_64 glibc-devel only brings stubs-64.h, which makes the compilation 
of these tools stop, because stubs-32.h could not be found.

What would be the correct way of fixing this?


regards,
 andreas