devel/skalibs: Upgrade to version 2.14.5.1
Changes from the NEWS file:
- Bugfixes.
- Support for shared libraries on MacOS.
- New sysdeps to support old MacOS, kevent(), subreapers.
- crc32c implementation: skalibs/crc32c.h
- New skalibs/prog.h header for PROG modifications
- New functions: symlink_at, mkdirp, mkdirp2, mkntemp, atomic_symlink4, qsortr, bsearchr, env_dump4, socket_tcpdelay
- New gol subsystem: getopt_long, but with a better API. It is
actually smaller and easier to use than subgetopt.
- New avltreeb macros.
- New keventbridge subsystem.
- Some documentation for buffer.h