arch: Add a script to create syscalls.csv

Given a set of syscall/arch/kernel-version tables generated from
the previous commit, convert these tables to a libseccomp
syscalls.csv.

The steps to generate the libseccomp syscalls.csv for all kernel
versions from v3.0 to v6.16 are as follows:

	$ time ./src/arch-build-kver-tables.py -d {syscalls_path}
		-k {kernel_path}
	Building version table for kernel 3.0
	...
	./src/arch-build-kver-tables.py -d ... -
		real    76m50.202s
		user    31m0.841s
		sys     48m17.962s

	$ ./src/arch-create-syscalls-csv.py -d {path to tables}
		-k {kernel path} -o src/syscalls.csv

Signed-off-by: Tom Hromatka <[email protected]>
Signed-off-by: Paul Moore <[email protected]>

Author: drakenclimber