ncurses 6.2 - patch 20200711

ncurses 6.2 - patch 20200711

+ fix pound-sign mapping in acsc of linux2.6 entry (report by Ingo
  Bruckl).
+ additional changes for building with Visual Studio C++ and msys2
  (reports/patches by "Maarten Anonymous")
+ build-improvements for Windows 10 and MinGW (patch by Juergen
  Pfeifer).
+ fix a typo in curs_printw.3x (patch by William Pursell).
+ fix two errors in infotocap which allowed indexing outside the
  buffer (report/testcases by Zhang Gan).
+ update length of strings in infocmp's usage function to restore a
  trailing null on the longest string (report/testcase by Zhang Gen).