selftests/bpf: Pass target triple to get_sys_includes macro

When cross-compiling [1], the get_sys_includes make macro should use
the target system include path, and not the build hosts system include
path.

Make clang honor the CROSS_COMPILE triple.

[1] e.g. "ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- make"

Signed-off-by: Björn Töpel <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Tested-by: Anders Roxell <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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