skalibs: update to 2.14.0.0. Changes:

- Bugfixes.
- New accessor function: selfpipe_fd().
- New functions: slurpn(), openslurpnclose().
- slurp() and openslurpclose() are now macros.
- New strerr macros to warn with a "fatal" message.
- New cdb functions: cdb_hashv(), cdbmake_addv().
- child_spawn() revamp. Prototype change (last arg is a size_t).
- case_lowerb() and friends now use ctype.h functions.
- case_str() removed, strcasestr() fallback implementation added.
- cspawn(): finally unifying fork() and posix_spawn().
- Better support for nonstandard posix_spawn subfunctions.
- Lots of new sysdeps.

(schmonz)