change osx directory to macOS

src/utilities/x13/select_x13_binary.m

@@ -27,7 +27,7 @@ dseries_src_root = strrep(which('initialize_dseries_class'),'initialize_dseries_
 dseries_x13_root = sprintf('%s%s%s%s%s%s%s', dseries_src_root, '..', filesep(), 'externals', filesep(), 'x13', filesep());
 
 if ismac()
-    x13_binary = sprintf('%s%s%s', dseries_x13_root, 'osx', filesep());
+    x13_binary = sprintf('%s%s%s', dseries_x13_root, 'macOS', filesep());
     if is64bit()
         x13_binary = sprintf('%s%s%s%s', x13_binary, '64', filesep(), 'x13as');
     else