ncurses 5.9 - patch 20111210

+ modify configure script to check if thread library provides
  pthread_mutexattr_settype(), e.g., not provided by Solaris 2.6
+ modify configure script to suppress check to define _XOPEN_SOURCE
  for IRIX64, since its header files have a conflict versus
  _SGI_SOURCE.
+ modify configure script to add ".pc" files for tic- and
  tinfo-libraries, which were omitted in recent change (cf: 20111126).
+ fix inconsistent checks on $PKG_CONFIG variable in configure script.