With the brand-new syntax extension of Kconfig, we can directly
check the compiler capability in the configuration phase.
If the cc-can-link.sh fails, the BPFILTER_UMH is automatically
hidden by the dependency.
I also deleted 'default n', which is no-op.
Signed-off-by: Masahiro Yamada
Acked-by: Daniel Borkmann
Acked-by: Alexei Starovoitov
Signed-off-by: David S. Miller