posix_sysconf constants

## posix_sysconf() constants

`POSIX_SC_ARG_MAX` (int)
  The maximum number of bytes the arguments (and environment variables) can have. Available as of PHP 8.3.0.
`POSIX_SC_PAGESIZE` (int)
  The number of bytes of the current page. Available as of PHP 8.3.0.
`POSIX_SC_NPROCESSORS_CONF` (int)
  The number of cpus configured system wise. Available as of PHP 8.3.0.
`POSIX_SC_NPROCESSORS_ONLN` (int)
  The number of cpus currently active system wise. Available as of PHP 8.3.0.
`POSIX_SC_CHILD_MAX` (int)
  The maximum number of simultaneous processes per user. Available as of PHP 8.4.0.
`POSIX_SC_CLK_TCK` (int)
  The number of clock ticks per second. Available as of PHP 8.4.0.

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