samples/bpf: Use --target from cross-compile
For cross compiling the target triple can be inherited from cross-compile prefix as it's done in CLANG_FLAGS from kernel makefile. So copy-paste this decision from kernel Makefile. Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20191011002808.28206-4-ivan.khoronzhuk@linaro.org
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