tools lib: Adopt skip_spaces() from the kernel sources

Same implementation, will be used to replace ad-hoc equivalent code in
tools/.

Cc: Adrian Hunter <[email protected]>
Cc: André Goddard Rosa <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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