perf evsel: display dmesg command of showing a hardcoded path

In non-FHS compliant distros like NixOS, nothing resides in `/bin`
and `/usr/bin`. Instead dynamically symlinked into
`/run/current-system/sw/bin/`, the executable resides in `/nix/store`.

With this patch,`/bin` prefix from the dmesg command in the error
message is stripped.

Link: https://github.com/NixOS/nixpkgs/pull/258027

Signed-off-by: Masum Reza <[e-mail]>
Cc: Yunseong Kim <[e-mail]>
Cc: Ze Gao <[e-mail]>
Cc: Yang Jihong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/util/evsel.c

···
 
 	return scnprintf(msg, size,
 	"The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
-	"/bin/dmesg | grep -i perf may provide additional information.\n",
+	"\"dmesg | grep -i perf\" may provide additional information.\n",
 			 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
 }