ncurses 6.0 - patch 20160521

ncurses 6.0 - patch 20160521

+ improved manual page description of tset/reset versus window-size.
+ fixes to work with a slightly broken compiler configuration which
  cannot compile "Hello World!" without adding compiler options
  (report by Ola x Nilsson):
  + pass appropriate compiler options to the CF_PROG_CC_C_O macro.
  + when separating compiler and options in CF_CC_ENV_FLAGS, ensure
    that all options are split-off into CFLAGS or CPPFLAGS
  + restore some -I options removed in 20140726 because they appeared
    to be redundant.  In fact, they are needed for a compiler that
    cannot combine -c and -o options.