aremmell / libsir / 1045

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Add `_sir_nprocs` which returns a processor count (i.e. vCPUs, logical processors, threads) (#322)

* Add `_sir_nprocs` which returns a count of (hopefully available)
logical processors.

* Working
  | | | |
  |-|-|-|
  | Linux/glibc | Linux/musl | Android |
  | Cygwin | Solaris | illumos |
  | AIX | FreeBSD | NetBSD |
  | OpenBSD | macOS | Haiku |
  | Linux/uClibc-ng | Wasm/Node.js | DragonFly BSD |
  | Windows | | |
  | | | |

* Untested
  | | |
  |-|-|
  | GNU/Hurd | SerenityOS | 
  | | |


* SerenityOS does support _SC_NPROCESSORS_ONLN so it should work there.

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Signed-off-by: Jeffrey H. Johnson <trnsz@pobox.com>

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