perf build: Do not duplicate CFLAGS in Python extension builds

perf build: Do not duplicate CFLAGS in Python extension builds

setuptools already uses CFLAGS.  Passing CFLAGS with additional flags as
extra compile arguments causes CFLAGS to effectively get passed twice:

$ make -C tools/perf V=1 JOBS=1
...
building 'perf' extension
gcc [CFLAGS] -fPIC -Iutil/include -I/usr/include/python3.14 \
  -c /root/linux/tools/perf/util/python.c \
  -o python_ext_build/tmp/root/linux/tools/perf/util/python.o \
  [CFLAGS] \
  -fno-strict-aliasing -Wno-write-strings -Wno-unused-parameter \
  -Wno-redundant-decls -Wno-cast-function-type \
  -Wno-declaration-after-statement

Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Hendrik Brueckner <brueckner@linux.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jan Polensky <japo@linux.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>