ncurses 5.9 - patch 20120317

ncurses 5.9 - patch 20120317

+ correct a check made in lib_napms.c, so that terminfo applications
  can again use napms() (cf: 20110604).
+ add a note in tic.h regarding required casts for ABSENT_BOOLEAN
  (cf: 20040327).
+ correct scripting for --disable-echo option in test/configure.
+ amend check for missing c++ compiler to work when no error is
  reported, and no variables set (cf: 20021206).
+ add/use configure macro CF_DISABLE_ECHO.