Add script to build documentation on win32 without mingw

src/tools/msvc/Solution.pm

@@ -229,6 +229,13 @@ EOF
  		   last;
         }
   	}
+
+  	open(O, ">doc/src/sgml/version.sgml") || croak "Could not write to version.sgml\n";
+  	print O <<EOF;
+<!entity version "$self->{strver}">
+<!entity majorversion "$self->{majorver}">
+EOF
+   close(O);
 }
 
 sub AddProject {