take into account sysctl deprecation in modern linux kernels #122
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As described in https://www.phoronix.com/news/Linux-5.5-Kills-SYSCTL-SYSCALL,
sys/sysctl.h
has been deprecated for a while, as a result of which QPhiX and/or applications using it fail to build on some systems (such as on github's CI runners).This seems to fix the issue in the sense that it requires
sysconf
to be available ifsysctl
is not. I'm not actually sure that eithersys/types.h
orsys/sysctl.h
are required for using__rdtsc
but I don't know so I wanted to make a minimal change which preserves the status quo ofsys/sysctl.h
is available.Note that for testing reasons I had to include #121 in here as well.