sys/tools/syscalls: desupport capabilities.conf

We haven't used this since commit be67ea40c5a0 in 2021 so stop carrying
it forward.

Also remove support for setting the list in syscalls.conf via the

sys/tools/syscalls: desupport capabilities.conf

We haven't used this since commit be67ea40c5a0 in 2021 so stop carrying
it forward.

Also remove support for setting the list in syscalls.conf via the
capenabled variable. This was last used by cloudabi (removed in 2021
by commit cf0ee8738e31).

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Refactor makesyscalls.lua into a library

* main.lua replicates the functionality of makesyscalls.lua
* Individual files are generated by their associated module
* Modules can be called as standalo

Refactor makesyscalls.lua into a library

* main.lua replicates the functionality of makesyscalls.lua
* Individual files are generated by their associated module
* Modules can be called as standalone scripts to generate a specific
file
* Data and procedures are performed by objects instead of procedual code
* Bitmasks are replaced by declarative types
* Temporary files are no longer produced, writing is stored in memory
* Comments provide explanation to functions and semantics

Google Summer of Code 2024 Final Work Product

Co-authored-by: Warner Losh <imp@freebsd.org>
Co-authored-by: Kyle Evans <kevans@freebsd.org>
Co-authored-by: Brooks Davis <brooks@freebsd.org>
Sponsored by: Google (GSoC 24)
Pull Request: https://github.com/freebsd/freebsd-src/pull/1362
Signed-off-by: agge3 <sterspark@gmail.com>

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