Log Message:
Update to 2.7.0.0. From the changelog:
----------

- Bugfixes.
- New functions: ipc_timed_sendv(), unlink_void(), genset_deepfree(),
  gensetdyn_deepfree(), skagetln_loose(), skagetlnsep_loose()
- dir_close() now returns void and leaves errno unchanged
- absolutepath(), sarealpath_tmp(), avl*_deletnode(), mininetstring,
  prot functions removed
- djbunix.h doesn't include env.h anymore
- New functions: execvep_loose(), byte_zzero(), openb_read(), sig0_scan()
- New function family: skalibs/genqdyn.h
- New dir_fd function wrapping dirfd() (Solaris doesn't have dirfd())
- memmem implementation for platforms that don't provide it.
- memmem wrappers: byte_search, siovec_search.
- New functions: atomic_symlink, skagetlnmaxsep, child_spawn3
- New header: skalibs/posixplz.h, some header reorganization.
- New family of functions: textmessage and textclient
- skalibs/environ.h and skalibs/getpeereid.h are now obsolescent.
- New functions: access_at() (MacOS and Solaris don't support faccessat),
  skaclient_timed_aflush().
- stralloc.h and tai.h are suitable for inclusion in C++ headers.
- New sysdep: SKALIBS_HASODIRECTORY. (MacOS doesn't support O_DIRECTORY.)
- New function: lock_unx().
- Optimized packing/unpacking routines.
- Better CPPFLAGS/CFLAGS/LDFLAGS management.
- openwritenclose() and openwritevnclose() now use mkstemp.