Log message:
macports-legacy-support: update to 1.2.3. Changes:

1.2.3:
- Add stpncpy() support, along with associated tests
- Allow reexport on newer systems
- test_dirfuncs_compat: fix warning

1.2.2:
- dirfuncs_compat: Add comment regarding retention
- sysconf(_SC_PHYS_PAGES): Always use wrapper on i386
- sys/socket.h: Fix CMSG_DATA definition in <10.6
- Add test for os/lock.h
- Add more library symbols for Rust support

1.2.1:
- Added compatibility entry points. No change to existing code.

1.2.0:
- fdopendir: fixes/improvements
- Build fixes for dirent.h, on 10.9 and 10.4

Log message:
Add devel/macports-legacy-support

Installs wrapper headers and library functions that add common
functions missing in various older OSX releases to bring them
approximately up to current expected standards.

This package differs from libnbcompat in that it includes
Mac OS X specific APIs.