+20200704
+ + modify version-check with Ada generics to use the same pattern as in
+ the check for supported gnat versions (report by Pascal Pignard).
+ > additional changes for building with Visual Studio C++ and msys2
+ (patches by "Maarten Anonymous"):
+ + adjust headers/declarations to provide for "dllimport" vs "dllexport"
+ declarations when constructing DLLs, to worko with Visual Studio C++.
+