These xalloc functions are a private function for the library. If using
programs need them, then they should make their own error reporting or
use a common file.
Previously the version of libproc always tracked the version of procps.
This doesn't work when other non-procps programs link to the library as
they are always playing catch up.
This change makes the library version independent of the procps version.
It will only be incremented when needed.
