ncurses 5.9 - patch 20120630

+ add --enable-interop to sample package scripts (suggested by Juergen
  Pfeifer).
+ update CF_PATH_SYNTAX macro, from mawk changes.
+ modify mk-0th.awk to allow for generating llib-ltic, etc., though
  some work is needed on cproto to work with lib_gen.c to update
  llib-lncurses.
+ remove redundant getenv() cal in database-iterator leftover from
  cleanup in 20120622 changes (report by Sven Joachim).