libs/bsd: Implement getentropy(2).

With generic_syscall to avoid using a FD.

Change-Id: Id1702118bb673f06a861e4f0ad3401ce3d45cbd0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/31
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

refactor: Swap %Ld for %lld in all format usages

* %Ld is an undocumented alias for %lld in glibc.
* muslc doesn't implement it for this reason.
* While we will likely never drop %Ld support,
lets clean house and set a better example.

Change-Id: Id46dad3104abae483e80cc5c05d1464d3ecd8030
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6636
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

kernel: Drop non-standard GNU inline assignment syntax

* We needed this previously due to our gcc2 compiled kernel.
* Now that our kernel is always latest gcc, we can move to the
c++20 syntax for inline assignment.
* Improves compatibility with clang, less GNU-specific stuff

Change-Id: Ib7272a0a52554a31e9a0e788fd3f031db9049795
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5898
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

random: always use the PRNG, and use entropy sources to feed it

remove the yarrow module. the hardware modules can push entropy with queue_randomness().
virtio_rng will now push entropy every 300 seconds.
helps with #14937

Change-Id: If76c5deabf61dc616a0e051332f44b89deb6b8a1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5824
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

Add missing includes following previous commit.

All these files were making use of headers included indirectly
through AutoLock.h that are now no longer following the previous commit.

random: Fix mutex use-after-destroy.

sRandomLock is a driver-global lock used by all instances of the "random"
device, of which there can be more than one, it seems; and somehow some
are destroyed before others. I didn't really investigate too far to see
under what circumstances that occurs.

Found while trying to compile some ports; suddenly all attempted
reads of /dev/random started PANIC'ing with "mutex uninitialized".

CID 1108455 Structurally dead code

random: remove non Haiku code.

random: add a Virtio RNG module

* The default module is replaced by the Virtio RNG module when found.
* This can have the undesired effect of rendering /dev/urandom slow.
* Tested with the following QEmu command line option:
-device virtio-rng-pci,rng=rng0 -object rng-random,filename=/dev/random,id=rng0
* moved random.h to private/drivers headers.

random: added a bus interface for RNG modules.

* Yarrow RNG is the default RNG module.

random: move to bus_managers/

CID 1108455 Structurally dead code

random: remove non Haiku code.

random: add a Virtio RNG module

* The default module is replaced by the Virtio RNG module when found.
* This can have the undesired effect of rendering /dev/urandom slow.
* Tested with the following QEmu command line option:
-device virtio-rng-pci,rng=rng0 -object rng-random,filename=/dev/random,id=rng0
* moved random.h to private/drivers headers.

random: added a bus interface for RNG modules.

* Yarrow RNG is the default RNG module.

random: move to bus_managers/