tools/build: Fix -s detection code in tools/scripts/Makefile.include

As Dmitry described in [1] changelog the current way of detecting
-s option is broken for new make.

Changing the tools/build -s option detection the same way as it was
fixed for root Makefile in [1].

[1] 4bf73588165b ("kbuild: Port silent mode detection to future gnu make.")

Cc: Dmitry Goncharov <[email protected]>
Signed-off-by: Jiri Olsa <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: KP Singh <[email protected]>
Cc: Martin KaFai Lau <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Yonghong Song <[email protected]>
Cc: John Fastabend <[email protected]>
Cc: Hao Luo <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Stanislav Fomichev <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Quentin Monnet <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Andrii Nakryiko <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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