arm: Use /proc/cpuinfo on linux if getauxval is unavailable

On really old libc versions, getauxval isn't available. Fall back on /proc/cpuinfo in those cases, just like we do on android too.

added ARM label

requested review from @gramner

approved this merge request

approved this merge request

added 12 commits

• 7944237d...718b62c8 - 11 commits from branch videolan:master
• bed3a343 - arm: Use /proc/cpuinfo on linux if getauxval is unavailable

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enabled an automatic merge when all merge checks for bed3a343 pass

merged

changed milestone to %1.5.1