Restore gethostbyaddr_r wrapper and remove getpw{nam,uid}_r wrappers for
newer versions of FreeBSD 5.X.
Drop use of deprecated AINC variable.
Reenable use of ld(1) to restore the LINUXTHREADS_WRAP_API option.
Rename __thread to __xthread in prototypes to avoid conflict with
new gcc keyword.
Bump port revision.