perf python: Account for multiple words in CC

Sometimes build systems may append options e.g. --sysroot etc. to CC
variable especially in cross-compile environments like yocto project
where CC varable is composed of cross-compiler name and some needed
options for it to work in a relocatable environment.

Therefore separate out the compiler name from rest of the options in CC,
then add the options via second argument to Popen() API

Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: Khem Raj <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Fangrui Song <[email protected]>
Cc: Florian Fainelli <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Keeping <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Sedat Dilek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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