ncurses 6.2 - patch 20210403

ncurses 6.2 - patch 20210403

+ fix some cppcheck warnings, mostly style, in ncurses library and
  progs directory.
+ improve description of BSD-style padding in curs_termcap.3x
+ improved CF_C11_NORETURN macro, from byacc changes.
+ fix "--enable-leak" in CF_DISABLE_LEAKS to allow turning
  leak-checking off later in a set of options.
+ relax modification-time comparison in CF_LINK_FUNCS to allow it to
  accept link() function with NFS filesystems which change the mtime
  on the link target, e.g., several BSD systems.
+ call delay_output_sp to handle BSD-style padding when tputs_sp is
  called, whether directly or internally, to ensure that the SCREEN
  pointer is passed correctly (reports by Henric Jungheim, Juraj
  Lutter).