bpfilter: document build requirements for bpfilter_umh
It's not intuitively obvious that bpfilter_umh is a statically linked binary. Mention the toolchain requirement in the Kconfig help, so people have an easier time figuring out what's needed. Signed-off-by: NValdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: NMasahiro Yamada <masahiroy@kernel.org>
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