selftests/bpf: Fix broken riscv build

The selftests/bpf Makefile includes system include directories from
the host, when building BPF programs. On RISC-V glibc requires that
__riscv_xlen is defined. This is not the case for "clang -target bpf",
which messes up __WORDSIZE (errno.h -> ... -> wordsize.h) and breaks
the build.

By explicitly defining __risc_xlen correctly for riscv, we can
workaround this.

Fixes: 167381f3eac0 ("selftests/bpf: Makefile fix "missing" headers on build with -idirafter")
Signed-off-by: Björn Töpel <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: Luke Nelson <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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