swap raw syscall numbers with syscall.ph for easier porting

swap raw syscall numbers with syscall.ph for easier porting

Raw syscall numbers were not platform independent, so replace them
with the helpers provided from the syscall.ph perl bits helper.

This makes reading the code easier as a nice side effect.

As syscall.ph is not an ordinary module and makes problems when it is
required by multiple modules we make a own module PVE::Syscall which
loads it and allows to export the necessary constants in a sane way.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>