ncurses 6.2 - patch 20210206

ncurses 6.2 - patch 20210206

+ provide for wide-characters as background character in wbkgrnd
  (report/testcase by Anton Vidovic)
+ add name for Fedora's pcre2 to configure check for "--with-pcre2"
  option, from xterm #363 -TD
+ modify adjustment in PutCharLR to restore the cursor position before
  writing to the lower-right corner, rather than decrementing the
  cursor column, in case it was a double-width character (cf: 20210130).