patchperf probe: skip test_uprobe_from_different_cu if there is no gcc

> Without gcc, the test will fail.
>
> On cleanup, ignore probe removal errors. Otherwise, in case of an error
> adding the probe, the temporary directory is not removed.
>
> Fixes: 56cbeacf1435 ("perf probe: Add test for regression introduced by switch to die_get_decl_file()")
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> Cc: Adrian Hunter <adrian.hunter@intel.com>
> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
> Cc: Ian Rogers <irogers@google.com>
> Cc: Ingo Molnar <mingo@redhat.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>
> Signed-off-by: Georg Müller <georgmueller@gmx.net>
> Link: https://lore.kernel.org/r/CAP-5=fUP6UuLgRty3t2=fQsQi3k4hDMz415vWdp1x88QMvZ8ug@mail.gmail.com/
> ---
>   tools/perf/tests/shell/test_uprobe_from_different_cu.sh | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/tests/shell/test_uprobe_from_different_cu.sh b/tools/perf/tests/shell/test_uprobe_from_different_cu.sh
> index 00d2e0e2e0c2..319f36ebb9a4 100755
> --- a/tools/perf/tests/shell/test_uprobe_from_different_cu.sh
> +++ b/tools/perf/tests/shell/test_uprobe_from_different_cu.sh
> @@ -4,6 +4,12 @@
>
>   set -e
>
> +# skip if there's no gcc
> +if ! [ -x "$(command -v gcc)" ]; then
> +        echo "failed: no gcc compiler"
> +        exit 2
> +fi
> +
>   temp_dir=$(mktemp -d /tmp/perf-uprobe-different-cu-sh.XXXXXXXXXX)
>
>   cleanup()
> @@ -11,7 +17,7 @@ cleanup()
>   	trap - EXIT TERM INT
>   	if [[ "${temp_dir}" =~ ^/tmp/perf-uprobe-different-cu-sh.*$ ]]; then
>   		echo "--- Cleaning up ---"
> -		perf probe -x ${temp_dir}/testfile -d foo
> +		perf probe -x ${temp_dir}/testfile -d foo || true
>   		rm -f "${temp_dir}/"*
>   		rmdir "${temp_dir}"
>   	fi
> --
> 2.41.0
>