perf tools: Add PARSE_OPT_DISABLED flag

In some cases, we need to reuse exising options with some of them
disabled.  To do that, add PARSE_OPT_DISABLED flag and
set_option_flag() function.

Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Hemant Kumar <[email protected]>
Cc: Alexander Yarygin <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Hemant Kumar <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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