libmcrypt-2.5.8: Add new package

[vaikas]

This is needed for some other packages. This is a draft to get some feedback, and I need to sort how to get a patch in there as well.

tested with:

7b260f9bfffd:/work/packages# apk add libmcrypt libmcrypt-dev libmcrypt-doc
fetch https://packages.wolfi.dev/os/aarch64/APKINDEX.tar.gz
(1/3) Installing libmcrypt (2.5.8-r0)
(2/3) Installing libmcrypt-dev (2.5.8-r0)
(3/3) Installing libmcrypt-doc (2.5.8-r0)
OK: 12 MiB in 17 packages
7b260f9bfffd:/work/packages# apk info -L libmcrypt libmcrypt-dev libmcrypt-doc
libmcrypt-2.5.8-r0 contains:
usr/lib/libmcrypt.so.4
usr/lib/libmcrypt.so.4.4.8
var/lib/db/sbom/libmcrypt-2.5.8-r0.spdx.json

libmcrypt-dev-2.5.8-r0 contains:
usr/bin/libmcrypt-config
usr/include/mcrypt.h
usr/include/mutils/mcrypt.h
usr/lib/libmcrypt.so
usr/share/aclocal/libmcrypt.m4
var/lib/db/sbom/libmcrypt-dev-2.5.8-r0.spdx.json

libmcrypt-doc-2.5.8-r0 contains:
usr/share/man/man3/mcrypt.3
var/lib/db/sbom/libmcrypt-doc-2.5.8-r0.spdx.json

[vaikas]

CI build action is a flake:

0s
Checking docker version
  /usr/bin/docker version --format '{{.Server.APIVersion}}'
  unable to resolve docker endpoint: open /certs/client/ca.pem: no such file or directory
  Error: Exit code [1](https://github.com/wolfi-dev/os/actions/runs/6127671348/job/16633790671?pr=5334#step:2:1) returned from process: file name '/usr/bin/docker', arguments 'version --format '{{.Server.APIVersion}}''.