ncurses 5.9 - patch 20140802

+ minor portability fixes for MinGW:
  + ensure WINVER is defined in makefiles rather than using headers
  + add check for gnatprep "-T" option
  + work around bug introduced by gcc 4.8.1 in MinGW which breaks
    "trace" feature:
    http://stackoverflow.com/questions/20877689/gcc-4-8-1-minggw-d-option-does-not-work-as-usual
+ fix most compiler warnings for Cygwin ncurses-examples.
+ restore "redundant" -I options in test/Makefile.in, since they are
  typically needed when building the derived ncurses-examples package
  (cf: 20140726).