ncurses 6.2 - patch 20200523

ncurses 6.2 - patch 20200523

+ update version-check for gnat to allow for gnat 10.x to 99.x
+ fix an uninitialized variable in lib_mouse.c changes (cf: 20200502)
+ add a check in EmitRange to guard against repeat_char emitting digits
  which could be interpreted as BSD-style padding when --enable-bsdpad
  is configured (report/patch by Hiltjo Posthuma).
+ add --disable-pkg-ldflags to suppress EXTRA_LDFLAGS from the
  generated pkg-config and ncurses*-config files, to simplify
  configuring in the case where rpath is used but the packager wants
  to hide the feature (report by Michael Stapelberg).
> fixes for building with Visual Studio C++ and msys2 (patches by
  "Maarten Anonymous"):
+ modify CF_SHARED_OPTS to generate a script which translates linker
  options into Visual Studio's dialect.
+ omit parentheses around function-names in generated lib_gen.c to
  work around a Visual Studio C++ limitation.