samples/bpf: Add -fsanitize=bounds to userspace programs

The sanitizer flag, which is supported by both clang and gcc, would make
it easier to debug array index out-of-bounds problems in these programs.

Make the Makfile smarter to detect ubsan support from the compiler and
add the '-fsanitize=bounds' accordingly.

Suggested-by: Mimi Zohar <[email protected]>
Signed-off-by: Jinghao Jia <[email protected]>
Signed-off-by: Jinghao Jia <[email protected]>
Signed-off-by: Ruowen Qin <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Tested-by: Jiri Olsa <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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