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doc: Add documentation for updating syscalls.csv

Add documentation on how to update syscalls.csv. NOTE - since we haven't
fully converted syscalls.csv over to containing valid kernel version
numbers, I have intentionally set all kernel version fields to
SCMP_KV_UNDEF.  We'll update the kernel versions in pull request #457.

Here are the exact steps and results for updating syscalls.csv to
kernels v6.14 through v7.0-rc7

$ apt install libc6-dev-x32

$ git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
$ git clone https://github.com/hrw/syscalls-table.git
$ git clone git@github.com:<yourrepo>/libseccomp.git

$ cd libseccomp

$ vim include/seccomp-kvers.h
  --> add new syscall enumerations

$ time ./src/arch-build-kver-tables.py -d ../syscalls-table -k ../linux -V 6.14,6.15,6.16,6.17,6.18,6.19,7.0-rc7
Building version table for kernel 6.14
Building version table for kernel 6.15
Building version table for kernel 6.16
Building version table for kernel 6.17
Building version table for kernel 6.18
Building version table for kernel 6.19
Building version table for kernel 7.0-rc7

real    2m47.672s
user    1m22.094s
sys     1m23.954s

$ time ./src/arch-update-syscalls-csv.py -a -d ./ -k ../linux -c
src/syscalls.csv -V 6.14,6.15,6.16,6.17,6.18,6.19,7.0-rc7
Updating src/syscalls.csv version table for kernel 6.14
Updating src/syscalls.csv version table for kernel 6.15
Updating src/syscalls.csv version table for kernel 6.16
Updating src/syscalls.csv version table for kernel 6.17
Updating src/syscalls.csv version table for kernel 6.18
Updating src/syscalls.csv version table for kernel 6.19
Updating src/syscalls.csv version table for kernel 7.0-rc7

real    0m30.112s
user    0m20.716s
sys     0m9.547s

$ vim include-seccomp-syscalls.h
  --> add new syscall __SNR and __PNR entries as appropriate

$ ./src/arch-syscall-check
  --> Make changes as recommended by this script
  --> Re-run this script until there are no more changes to be made

$ c... (continued)

3148 of 3544 relevant lines covered (88.83%)

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Source Files on job amd64 - 24534055432.1