ncurses 6.2 - patch 20210417

+ extend --disable-pkg-ldflags option to also control whether $LDFLAGS
  from the build is provided in -config and .pc files (Debian #986764).
+ fix some cppcheck warnings, mostly style, in ncurses and c++
  libraries and progs directory.
+ fix off-by-one limit for tput's processing command-line arguments
  (patch by Hadrien Lacour).