Comment # 2 on bug 1127188 from Michal Suchanek

BPF UMH needs an userspace header to build. This is provided by glibc but our
crosscompilers do not have glibc headers.

I patched the kconfig so this option can be configured and disabled it on
master.

If we want to build with this option we either need to fix the crosscompilers
or change kbuild to run build tests natively.