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