ncurses 5.9 - patch 20120331

ncurses 5.9 - patch 20120331

+ update Ada95/configure to use CF_DISABLE_ECHO (cf: 20120317).
+ correct order of use-clauses in st-256color -TD
+ modify configure script to look for gnatgcc if the Ada95 binding
  is built, in preference to the default gcc/cc (suggested by
  Nicolas Boulenguez).
+ modify configure script to ensure that the same -On option used for
  the C compiler in CFLAGS is used for ADAFLAGS rather than simply
  using -O3 (suggested by Nicolas Boulenguez)