Fix compilation if sys/sysctl.h is not present #84
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Glibc 2.32 removes sys/sysctl.h as it is no longer needed. This commit uses __has_include to check whether the header exists and only includes it if it does.
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Glibc 2.32 removes sys/sysctl.h. This commit fixes the compilation with newer versions of Glibc by checking for sys/sysctl.h with has_include.