[pve-devel] Factoring out raw syscall numbers to make porting easier

[Thomas Lamprecht]

We tackled already quite a few problems regarding platform independency and
bootstrapping of PVE.
One of the last things which needs fixing before we can build our
packages on ARM 64 (aka aarch64) are some syscalls which we need.
As (very) sadly Linux syscalls numbers aren't platform independent we need to
make a mapping from syscall to their platform specific identifiers on each
target platform (I understand that not all can be available on all platforms,
but how hard would it have been to use the same number for the exact same ones
:/).

This mapping gets done with the following patches.