htop

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This PR aims to address 2 issues with htop on current Solaris:

1. htop does not build because Solaris's sys/sysinfo.h defines CPU_KERNEL which collides with definition within htop
2. when run in a Non-Global Zone, kstat module "zones" is not available thus kstat_lookup() returns NULL making htop to crash due to NULL pointer dereference in SolarisProcessList_readZoneName().

fixed missing symbol when building on Linux

Thanks, @senjan - good catch. Keeping track of changes on both illumos and Oracle Solaris can be quite a chore. Contributions are always appreciated!

is supporting an outdated OS really that important?

@dodona2 Solaris 11.4 is only nine months old. There are still pockets of industry users out there.

Merged here: htop-dev/htop@b30c22d (though I renamed the somewhat cryptic "CPU_KRNL" to "CPU_SYSTEM")