ncurses 6.2 - patch 20200822

ncurses 6.2 - patch 20200822

+ improve version-number extraction in MKlib_gen.sh
+ make the test-package for manpages installable by adjusting the
  man_db.renames file.
+ correct an off-by-one loop-limit in convert_strings function
  (report by Yue Tai).
+ add CF_SHARED_OPTS cases for HPE NonStop systems (Randall S Becker).
+ modify CF_SHARED_OPTS case for NetBSD to use the same "-shared"
  option for the non-rpath case as for the rpath case, to allow gcc to
  provide suitable runtime initialization (report by Rajeev V Pillai).