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

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

tools/build/Makefile.build

···
   Q=@
 endif
 
-ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
+# If the user is running make -s (silent mode), suppress echoing of commands
+# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
+ifeq ($(filter 3.%,$(MAKE_VERSION)),)
+short-opts := $(firstword -$(MAKEFLAGS))
+else
+short-opts := $(filter-out --%,$(MAKEFLAGS))
+endif
+
+ifneq ($(findstring s,$(short-opts)),)
   quiet=silent_
 endif